About the Number 399 (three hundred ninety-nine)

nBAB number 399 was about the number 7810 and it was posted on 19 December 2010. This nBAB for the number 399 was the 400th nBAB.

   MathBabbler Number Analyst (MBNA) output:
   =========================================
   399 is a natural, whole, integer
   399 is odd
   399 proper divisors are: 1,3,7,19,21,57,133,
   399 is deficient (sum of divisors is 241)
   399 is unhappy
   399 is a Harshad number
   399 is not prime
   399 has the prime factors: 3*7*19 (sum=29)
   399 is sphenic (had 3 unique prime factors)
   399 sum of prime factors is: 29
   399 is a lucky number
   399 is ThurmNumber
   399 is the sum of 11 consecutive primes
   399 = 17 + 19 + 23 + 29 + 31 + 37 + 41 + 43 + 47 + 53 + 59
   399 in octal is 0617
   399 in hexadecimal is 0x18f
   399 in binary is 110001111 (is evil)
   399 nearest square numbers: -38...1 (361...400 [20])
   sqrt(399) = 19.975
   ln(399) = 5.98896
   log(399) = 2.60097
   399 reciprocal is .00250626566416040100250626566416
   399! is 1.60086e+866
   399 is 127.006 Pi years
   399 is 19 score and 19 years
   399 written as a Roman numeral is CCCXCIX
   399 = 200^2 - 199^2 and 200 + 199 = 399

log9(399) = 2.72569, which when rounded down to the nearest hundredth equals e (2.7182818284590) rounded up to the nearest hundredth.


Creator: Gerald Thurman [gthurman@gmail.com]
Created: 19 December 2010

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