39993904 has 10 divisors (see below), whose sum is σ = 77488220. Its totient is φ = 19996944.

The previous prime is 39993893. The next prime is 39993923. The reversal of 39993904 is 40939993.

It is a super-2 number, since 2×39993904² = 3199024714322432, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1249794 + ... + 1249825.

It is an arithmetic number, because the mean of its divisors is an integer number (7748822).

Almost surely, 2^39993904 is an apocalyptic number.

It is an amenable number.

39993904 is a deficient number, since it is larger than the sum of its proper divisors (37494316).

39993904 is a wasteful number, since it uses less digits than its factorization.

39993904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2499627 (or 2499621 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 46.

The square root of 39993904 is about 6324.0733708584. The cubic root of 39993904 is about 341.9778150971.

The spelling of 39993904 in words is "thirty-nine million, nine hundred ninety-three thousand, nine hundred four".