399120904 has 32 divisors (see below), whose sum is σ = 921049920. Its totient is φ = 157893696.

The previous prime is 399120833. The next prime is 399120919. The reversal of 399120904 is 409021993.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 273394 + ... + 274849.

It is an arithmetic number, because the mean of its divisors is an integer number (28782810).

Almost surely, 2^399120904 is an apocalyptic number.

It is an amenable number.

399120904 is an abundant number, since it is smaller than the sum of its proper divisors (521929016).

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

399120904 is a wasteful number, since it uses less digits than its factorization.

399120904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548269 (or 548265 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 399120904 is about 19978.0105115600. The cubic root of 399120904 is about 736.2661342611.

The spelling of 399120904 in words is "three hundred ninety-nine million, one hundred twenty thousand, nine hundred four".