399373928 has 16 divisors (see below), whose sum is σ = 792874980. Its totient is φ = 187940608.

The previous prime is 399373927. The next prime is 399373957. The reversal of 399373928 is 829373993.

It can be written as a sum of positive squares in 2 ways, for example, as 380172004 + 19201924 = 19498^2 + 4382^2 .

It is a super-2 number, since 2×399373928² = 318999068732298368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 399373928.

It is not an unprimeable number, because it can be changed into a prime (399373927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1468151 + ... + 1468422.

Almost surely, 2^399373928 is an apocalyptic number.

It is an amenable number.

399373928 is a deficient number, since it is larger than the sum of its proper divisors (393501052).

399373928 is a wasteful number, since it uses less digits than its factorization.

399373928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2936596 (or 2936592 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 53.

The square root of 399373928 is about 19984.3420707313. The cubic root of 399373928 is about 736.4216875010.

The spelling of 399373928 in words is "three hundred ninety-nine million, three hundred seventy-three thousand, nine hundred twenty-eight".