39640625 has 28 divisors (see below), whose sum is σ = 51561840. Its totient is φ = 30450000.

The previous prime is 39640619. The next prime is 39640663. The reversal of 39640625 is 52604693.

It is not a de Polignac number, because 39640625 - 2⁴ = 39640609 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 671846 + ... + 671904.

Almost surely, 2^39640625 is an apocalyptic number.

It is an amenable number.

39640625 is a deficient number, since it is larger than the sum of its proper divisors (11921215).

39640625 is an frugal number, since it uses more digits than its factorization.

39640625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 39640625 is about 6296.0801297315. The cubic root of 39640625 is about 340.9679023116.

The spelling of 39640625 in words is "thirty-nine million, six hundred forty thousand, six hundred twenty-five".