39897904 has 20 divisors (see below), whose sum is σ = 78571360. Its totient is φ = 19621440.

The previous prime is 39897883. The next prime is 39897911. The reversal of 39897904 is 40979893.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19464 + ... + 21415.

It is an arithmetic number, because the mean of its divisors is an integer number (3928568).

Almost surely, 2^39897904 is an apocalyptic number.

It is an amenable number.

39897904 is a deficient number, since it is larger than the sum of its proper divisors (38673456).

39897904 is a wasteful number, since it uses less digits than its factorization.

39897904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40948 (or 40942 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 39897904 is about 6316.4787658948. The cubic root of 39897904 is about 341.7039719198.

The spelling of 39897904 in words is "thirty-nine million, eight hundred ninety-seven thousand, nine hundred four".