399084864 has 56 divisors (see below), whose sum is σ = 1058009568. Its totient is φ = 132764160.

The previous prime is 399084787. The next prime is 399084871. The reversal of 399084864 is 468480993.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110934 + ... + 114474.

It is an arithmetic number, because the mean of its divisors is an integer number (18893028).

Almost surely, 2^399084864 is an apocalyptic number.

It is an amenable number.

399084864 is an abundant number, since it is smaller than the sum of its proper divisors (658924704).

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

399084864 is a wasteful number, since it uses less digits than its factorization.

399084864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4143 (or 4133 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 51.

The square root of 399084864 is about 19977.1084994801. The cubic root of 399084864 is about 736.2439723632.

The spelling of 399084864 in words is "three hundred ninety-nine million, eighty-four thousand, eight hundred sixty-four".