39904428 has 24 divisors (see below), whose sum is σ = 94387888. Its totient is φ = 13118976.

The previous prime is 39904421. The next prime is 39904429. The reversal of 39904428 is 82440993.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39904421) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 21901 + ... + 23652.

Almost surely, 2^39904428 is an apocalyptic number.

It is an amenable number.

39904428 is an abundant number, since it is smaller than the sum of its proper divisors (54483460).

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

39904428 is a wasteful number, since it uses less digits than its factorization.

39904428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45633 (or 45631 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 39904428 is about 6316.9951717569. The cubic root of 39904428 is about 341.7225957487.

The spelling of 39904428 in words is "thirty-nine million, nine hundred four thousand, four hundred twenty-eight".