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40 (forty) is the natural number following 39 and preceding 41.

Despite being related to the word "four" (4), 40 is spelled as "forty", not "fourty". The letters of the word "forty" are in alphabetical order; this is the only number that has this linguistic property in English.

In mathematics

Forty is an octagonal number, and as the sum of the first four pentagonal numbers, it is a pentagonal pyramidal number. Adding up some subsets of its divisors (e.g., 1, 4, 5, 10 and 20) gives 40, hence 40 is a semiperfect number.

Given 40, the Mertens function returns 0. 40 is the smallest number n with exactly 9 solutions to the equation φ(x) = n.

Forty is the number of n-queens problem solutions for n = 7.

40 is a repdigit in base 3 (1111) and a Harshad number in base 10.

In science

The atomic number of zirconium.

Negative forty is the temperature at which the Fahrenheit and Celsius scales correspond; that is, −40°F = −40°C. It is referred to as either "minus forty" or "forty below".

Astronomy

Messier object M40, a magnitude 9.0 double star in the constellation Ursa Major

The New General Catalogue object NGC 40, a magnitude 12.4 planetary nebula in the constellation Cepheus

The Saros number of the

solar eclipse series which began on -1653 May 28 and ended on -373 July 4. The duration of Saros series 40 was 1280.1 years, and it contained 72 solar eclipses.

lunar eclipse series which began on -1387 February 12 and ended on -71 April 12. The duration of Saros series 40 was 1316.2 years, and it contained 74 lunar eclipses.

In religion

The number 40 is significant in Jewish, Christian, Islamic, and other Middle Eastern traditions; it can also represent a rough calculation, a huge sum of units, or simply put, a lot of something.

"Forty days and forty nights" describes the period for which rain fell during Noah's flood

"Forty days" was the length of the period that the twelve spies explored the Promised Land (Numbers 13)

"Forty years" was the length of Israel's wandering in the wilderness. This period of years represents a generation, that is, the time it takes for a new generation to arise.

Moses' life is divided into three 40-year segments, separated by his fleeing from Egypt, and his return to lead the people out.

Several Israelite leaders and kings are said to have ruled for "forty years", that is, a generation. (Examples: Eli, Saul, David, Solomon.)

According to the Midrash, Moses spent three consecutive periods of "forty days and forty nights" on Mount Sinai:

He went up on the seventh day of Sivan, after God gave the Torah to the Jewish people, in order to learn the Torah from God, and came down on the seventeenth day of Tammuz, when he saw the Jews worshiping the Golden Calf and broke the tablets

He went up on the eighteenth day of Tammuz to beg forgiveness for the people's sin and came down without God's atonement on the twenty-ninth day of Av

He went up on the first day of Elul and came down on the tenth day of Tishrei, the first Yom Kippur, with God's atonement

Rabbi Akiva, the greatest expositor of the Oral Torah, only began learning how to read Hebrew when he was 40 years old

A mikvah consists of 40 se'ah (approximately 200 gallons) of water

40 lashes is one of the punishments meted out by the Sanhedrin (in actual practice, only 39 lashes were administered)

"Forty days and forty nights" was the period Jesus spent fasting in the wilderness, after which he was tempted by Satan.

Forty days was the period from Jesus' resurrection till his ascension into heaven.

In modern Christian practice, Lent consists of the 40 days preceding Easter. In much of Western Christianity Sundays are excluded from the count; in Eastern Christianity Sundays are included.

The dead are usually mourned for forty days in Muslim cultures

Ad-Dajjal roams around the Earth in forty days, forty days that can be as many as forty months, forty years, and so on.

Khadijah is said to be forty years old when she married Muhammad

Muhammad is said to be forty years old when he first received the relevation delivered by an angel

Some Russians believe that ghosts of the dead linger at the site of their death for forty days

In Eternalism, 40 is believed to be the number of the Corrupter, the Anti-Christ in Christianity, and is formed from the numbers 18+1+6+6+9. This also spells Raffi with correct numero-alphabetic translation.

In Hinduism, some popular religious prayers consist of forty shlokas or dohas (couplets, stanzas). The most common being the Hanuman Chalisa (chaalis is the Hindi term for 40) .

 

Domain Names for Sale. 

Street Names

Rare Short 4 Letter Word Domains

VINE.ST Vine Street 20PL.US 20 Plus
CANAL.ST Canal Street 30PL.US 30 Plus
8TH.ST 8th Street 40PL.US 40 Plus
60PL.US 50 Plus

Business Terms

DIFOTIS.COM Delivered In Full On Time In Spec

Word Domains incl. Sub Domains

BULLETCONTRACT.COM Bullet Contract INTR.AVENO.US Intravenous  
BULLETSTRATEGY.COM Bullet Strategy P.RECARIO.US Precarious  
BUYONOPENING.COM By On Opening T.REACHERO.US Treacherous
C.OURTEO.US Courteous  

Fun Combinations of Words and Numbers

CO.NSCIENTIO.US Conscientious  
AFFLU3NT.COM Affluent OE.SOPHAG.US Oesophagus
BR3AKOUT.COM Breakout GR.EENB.US Green Bus
COV3R.COM Cover YE.LLOWB.US Yellow Bus
INN3R.COM Inner BL.ACKB.US Black Bus
JUPIT3R.COM Jupiter
R3GAL.COM Regal

Eazy to Remember Abreviated Domains

SUMM3R.COM Summer EZBIL.COM Eazy Bill
WINT3R.COM Winter EZCFG.COM Eazy Configuration
EZCLK.COM Eazy Click

Unique Real English Words

EZDDD.COM You decide!
OOECIA.COM Lots of vowels EZEZY.COM Eazy Eazy
AEAEAN.COM Lots of vowels EZXLS.COM Eazy Excel
ZOAEAE.COM Lots of vowels EZYWEEK.COM Eazy Week
OUABAIO.COM Lots of vowels EZYYEAR.COM Eazy Year
GYPSYFY.COM 8 characters long, with no vowels
GYPSYRY.COM 8 characters long, with no vowels SUPERBOWLLXXXX.COM Superbowl 90 (2056)
.ASIA Domains

.ASIA Domains

BLACKINK.ASIA Black Ink GREENSEA.ASIA Green Sea
BLANKPAGE.ASIA Blank Page HARDWORK.ASIA Hard Work
BLACKTIE.ASIA Black Tie HAPPYJOY.ASIA Happy Joy
JOYBONG.ASIA Joy Bong

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