### About the Number 39 (thirty-nine)

On 19 October 2009 MathBabbler realized that he had nBABs for all of the numbers between 0 and 100 except for 46, 58 and `39`.

```   MathBabbler Number Analyst (MBNA) output:
=========================================
MathBabbler Number Analyst (MBNA) output:
=========================================
39 is a natural, whole, integer
39 is odd
39 proper divisors are: 1,3,13,
39 is deficient (sum of divisors is 17)
39 is unhappy
39 is not a Harshad number
39 is not prime
39 has the prime factors: 3*13 (sum=16)
39 is semiprime (biprime or 2-almost prime)
39 sum of prime factors is: 16
39 is undulating
39 in octal is 047
39 in hexadecimal is 0x27
39 in binary is 100111 (is evil)
39 nearest square numbers: -3...10 (36...49 )
sqrt(39) = 6.245
ln(39) = 3.66356
log(39) = 1.59106
39 reciprocal is .02564102564102564102564102564102
39! is 2.03979e+46
39 is 12.4141 Pi years
39 is 1 score and 19 years
39 written as a Roman numeral is XXXIX
```

`39` is a triple-X Roman numeral.

`39` is the sum of five consecutive prime numbers (3+5+7+11+13).

`39` is the sum of the first three powers of 3 (3^1+3^2+3^3).

`[Wikipedia]` "According to David Wells in The Penguin Dictionary of Curious and Interesting Numbers, `39` is the smallest mathematically uninteresting number. The book claims that it is also the first number that is simultaneously both interesting and uninteresting, thereby avoiding the paradox."

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 19 October 2009 (posted 22 October 2009) 