399015904 has 24 divisors (see below), whose sum is σ = 897786288. Its totient is φ = 171006720.

The previous prime is 399015889. The next prime is 399015917. The reversal of 399015904 is 409510993.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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, 890437 + ... + 890884.

It is an arithmetic number, because the mean of its divisors is an integer number (37407762).

Almost surely, 2^399015904 is an apocalyptic number.

It is an amenable number.

399015904 is an abundant number, since it is smaller than the sum of its proper divisors (498770384).

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

399015904 is a wasteful number, since it uses less digits than its factorization.

399015904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1781338 (or 1781330 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 40.

The square root of 399015904 is about 19975.3824494051. The cubic root of 399015904 is about 736.2015634142.

The spelling of 399015904 in words is "three hundred ninety-nine million, fifteen thousand, nine hundred four".