39904825 has 12 divisors (see below), whose sum is σ = 49560940. Its totient is φ = 31872960.

The previous prime is 39904819. The next prime is 39904829. The reversal of 39904825 is 52840993.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 16168441 + 23736384 = 4021^2 + 4872^2 .

It is not a de Polignac number, because 39904825 - 2¹⁵ = 39872057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39904829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27211 + ... + 28639.

Almost surely, 2^39904825 is an apocalyptic number.

It is an amenable number.

39904825 is a deficient number, since it is larger than the sum of its proper divisors (9656115).

39904825 is a wasteful number, since it uses less digits than its factorization.

39904825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2556 (or 2551 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 39904825 is about 6317.0265948467. The cubic root of 39904825 is about 341.7237289848.

The spelling of 39904825 in words is "thirty-nine million, nine hundred four thousand, eight hundred twenty-five".