39904864 has 24 divisors (see below), whose sum is σ = 82698840. Its totient is φ = 18902016.

The previous prime is 39904861. The next prime is 39904871. The reversal of 39904864 is 46840993.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 39904864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39904861) 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, 32209 + ... + 33424.

It is an arithmetic number, because the mean of its divisors is an integer number (3445785).

Almost surely, 2^39904864 is an apocalyptic number.

It is an amenable number.

39904864 is an abundant number, since it is smaller than the sum of its proper divisors (42793976).

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

39904864 is a wasteful number, since it uses less digits than its factorization.

39904864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65662 (or 65654 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 39904864 is about 6317.0296817413. The cubic root of 39904864 is about 341.7238403099.

The spelling of 39904864 in words is "thirty-nine million, nine hundred four thousand, eight hundred sixty-four".