399665328 has 40 divisors (see below), whose sum is σ = 1033670448. Its totient is φ = 133066752.

The previous prime is 399665311. The next prime is 399665339. The reversal of 399665328 is 823566993.

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, 41376 + ... + 50112.

Almost surely, 2^399665328 is an apocalyptic number.

It is an amenable number.

399665328 is an abundant number, since it is smaller than the sum of its proper divisors (634005120).

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

399665328 is a wasteful number, since it uses less digits than its factorization.

399665328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9701 (or 9695 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 51.

The square root of 399665328 is about 19991.6314491839. The cubic root of 399665328 is about 736.6007520266.

It can be divided in two parts, 399665 and 328, that added together give a palindrome (399993).

The spelling of 399665328 in words is "three hundred ninety-nine million, six hundred sixty-five thousand, three hundred twenty-eight".