39390625 has 14 divisors (see below), whose sum is σ = 49257182. Its totient is φ = 31500000.

The previous prime is 39390619. The next prime is 39390641. The reversal of 39390625 is 52609393.

It can be written as a sum of positive squares in 7 ways, for example, as 33085504 + 6305121 = 5752^2 + 2511^2 .

It is not a de Polignac number, because 39390625 - 2¹³ = 39382433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 13 ways as a sum of consecutive naturals, for example, 14365 + ... + 16885.

Almost surely, 2^39390625 is an apocalyptic number.

It is an amenable number.

39390625 is a deficient number, since it is larger than the sum of its proper divisors (9866557).

39390625 is an frugal number, since it uses more digits than its factorization.

39390625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2551 (or 2526 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 37.

The square root of 39390625 is about 6276.1951053166. The cubic root of 39390625 is about 340.2496004558.

The spelling of 39390625 in words is "thirty-nine million, three hundred ninety thousand, six hundred twenty-five".