39639904 has 12 divisors (see below), whose sum is σ = 78041124. Its totient is φ = 19819936.

The previous prime is 39639893. The next prime is 39639911. The reversal of 39639904 is 40993693.

It is a happy number.

39639904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619342 + ... + 619405.

It is an arithmetic number, because the mean of its divisors is an integer number (6503427).

Almost surely, 2^39639904 is an apocalyptic number.

It is an amenable number.

39639904 is a deficient number, since it is larger than the sum of its proper divisors (38401220).

39639904 is a wasteful number, since it uses less digits than its factorization.

39639904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238757 (or 1238749 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 43.

The square root of 39639904 is about 6296.0228716230. The cubic root of 39639904 is about 340.9658350775.

The spelling of 39639904 in words is "thirty-nine million, six hundred thirty-nine thousand, nine hundred four".