394336928 has 24 divisors (see below), whose sum is σ = 785079540. Its totient is φ = 194951680.

The previous prime is 394336919. The next prime is 394336931. The reversal of 394336928 is 829633493.

It can be written as a sum of positive squares in 2 ways, for example, as 370639504 + 23697424 = 19252^2 + 4868^2 .

It is a super-2 number, since 2×394336928² = 311003225568954368, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66383 + ... + 72078.

Almost surely, 2^394336928 is an apocalyptic number.

It is an amenable number.

394336928 is a deficient number, since it is larger than the sum of its proper divisors (390742612).

394336928 is a wasteful number, since it uses less digits than its factorization.

394336928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138560 (or 138552 counting only the distinct ones).

The product of its digits is 839808, while the sum is 47.

The square root of 394336928 is about 19857.9185213355. The cubic root of 394336928 is about 733.3126040054.

The spelling of 394336928 in words is "three hundred ninety-four million, three hundred thirty-six thousand, nine hundred twenty-eight".