399439584 has 72 divisors (see below), whose sum is σ = 1195707240. Its totient is φ = 126137088.

The previous prime is 399439561. The next prime is 399439609. The reversal of 399439584 is 485934993.

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 399439584.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31027 + ... + 41970.

It is an arithmetic number, because the mean of its divisors is an integer number (16607045).

Almost surely, 2^399439584 is an apocalyptic number.

It is an amenable number.

399439584 is an abundant number, since it is smaller than the sum of its proper divisors (796267656).

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

399439584 is a wasteful number, since it uses less digits than its factorization.

399439584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73032 (or 73021 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The square root of 399439584 is about 19985.9846892766. The cubic root of 399439584 is about 736.4620405383.

The spelling of 399439584 in words is "three hundred ninety-nine million, four hundred thirty-nine thousand, five hundred eighty-four".