399939504 has 20 divisors (see below), whose sum is σ = 1033177176. Its totient is φ = 133313152.

The previous prime is 399939473. The next prime is 399939509. The reversal of 399939504 is 405939993.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (399939509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4165989 + ... + 4166084.

Almost surely, 2^399939504 is an apocalyptic number.

It is an amenable number.

399939504 is an abundant number, since it is smaller than the sum of its proper divisors (633237672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399939504 is a wasteful number, since it uses less digits than its factorization.

399939504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8332084 (or 8332078 counting only the distinct ones).

The product of its (nonzero) digits is 1180980, while the sum is 51.

The square root of 399939504 is about 19998.4875428118. The cubic root of 399939504 is about 736.7691529937.

The spelling of 399939504 in words is "three hundred ninety-nine million, nine hundred thirty-nine thousand, five hundred four".