About the Number 40 (forty)

This nBAB was created as a result of MathBabbler working on a BAB about the 40th anniversary of Apollo 8, which entered lunar orbit on 24 December 1968.

   MathBabbler Number Analyst (MBNA) output:
   =========================================
   40 is a natural, whole, integer
   40 is even
   40 proper divisors are: 1,2,4,5,8,10,20,
   40 is refactorable (evenly divisable by # of divisors)
   40 is abundant (sum of divisors is 50)
   40 is unhappy
   40 is a Harshad number
   40 is not prime
   40 is undulating
   40 has the prime factors: 2*2*2*5
   40 in octal is 050
   40 in hexadecimal is 0x28
   40 in binary is 101000 (is evil)
   40 nearest square numbers: -4...9 (36...49 [7])
   sqrt(40) = 6.32456
   ln(40) = 3.68888
   log(40) = 1.60206
   40 reciprocal is .02500000000000000000000000000000
   40! is 8.15915e+47
   40 is 12.7324 Pi years
   40 is 2 scoreyears
   40 written as a Roman numeral is XL

Why is forty not spelled "fourty?"

[Wikipedi] Negative forty is the temperature at which the Fahrenheit and Celsius scales correspond (i.e. -40°F = -40°C)

The entrance door to CM-473 at Scottsdale Community College needs a hit of WD-40.

40 days... 40 nights... 40 winks... I-40... 40 years (ruby anniversary)... 40 hour work weeks...

Added the song titles "40" (by U2) and "#40 (by Dave Matthews Band) to Songs With Numbers In Their Titles. In addition, the band names Crush 40 and UB40 were added to Bands With Numbers In Their Names.

Update::2009.08.15

40 years ago on 8/15/1969, the Woodstock Festival began.

40 in base-11 in repdigit number 44 in base-10.

MathBabbler was 4013 (i.e. 52) years of age when he updated this nBAB.


Creator: Gerald Thurman [gthurman@gmail.com]
Created: 25 December 2008

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