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:
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   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 [7])
   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)

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