This nBAB about the number

`was created on Columbus Day 2009 (i.e.`

517`is the difference between 2009 and 1492). year`

517MathBabbler Number Analyst (MBNA) output: ========================================= 517 is a natural, whole, integer 517 is odd 517 proper divisors are: 1,11,47, 517 is deficient (sum of divisors is 59) 517 is unhappy 517 is not a Harshad number 517 is not prime 517 has the prime factors: 11*47 (sum=58) 517 is semiprime (biprime or 2-almost prime) 517 is a Smith number 517 sum of prime factors is: 58 517 is a lucky number 517 in octal is 01005 517 in hexadecimal is 0x205 517 in binary is 1000000101 (is odious) 517 nearest square numbers: -33...12 (484...529 [23]) sqrt(517) = 22.7376 ln(517) = 6.24804 log(517) = 2.71349 517 reciprocal is .00193423597678916827852998065764 517! is 1.2597e+1180 517 is 164.566 Pi years 517 is 25 score and 17 years 517 written as a Roman numeral is DXVIIAccording to NumberGossip.com,

`is the "smallest number n such that n+sigma(n)+sigma(sigma(n)) is a cube, where sigma(n) is the sum of all divisors."`

517sigma(517) = 576 (1+11+47+517) sigma(576) = 1651 (1+2+3+4+6+8+9+12+16+18+24+32+36+48+64+72+96+144+192+288+576)517+ 576 + 1651 = 2744 cuberoot(2744) = 14

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

**Created:** 12 October 2009

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