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 XLWhy is forty not spelled "fourty?"

`[Wikipedi]`

Negative forty is the temperature at which the Fahrenheit and Celsius scales correspond (i.e.`)`

-40°F = -40°CThe entrance door to CM-473 at Scottsdale Community College needs a hit of WD-

`.`

40

`days...`

40`nights...`

40`winks... I-`

40`...`

40`years (ruby anniversary)...`

40`hour work weeks...`

40Added the song titles "

`" (by U2) and "`

40`(by Dave Matthews Band) to Songs With Numbers In Their Titles. In addition, the band names Crush`

#40`and UB`

40`were added to Bands With Numbers In Their Names.`

40## Update::2009.08.15

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

40

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

40MathBabbler was

40_{13}(i.e. 52) years of age when he updated this nBAB.

**Creator:** Gerald Thurman
[gthurman@gmail.com]

**Created:** 25 December 2008

This work is licensed under a Creative Commons Attribution 3.0 United States License.