12639625 has 8 divisors (see below), whose sum is σ = 15774408. Its totient is φ = 10111600.

The previous prime is 12639577. The next prime is 12639637. The reversal of 12639625 is 52693621.

It can be written as a sum of positive squares in 4 ways, for example, as 915849 + 11723776 = 957^2 + 3424^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12639625 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 7 ways as a sum of consecutive naturals, for example, 50434 + ... + 50683.

It is an arithmetic number, because the mean of its divisors is an integer number (1971801).

Almost surely, 2^12639625 is an apocalyptic number.

It is an amenable number.

12639625 is a deficient number, since it is larger than the sum of its proper divisors (3134783).

12639625 is an equidigital number, since it uses as much as digits as its factorization.

12639625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101132 (or 101122 counting only the distinct ones).

The product of its digits is 19440, while the sum is 34.

The square root of 12639625 is about 3555.2250280397. The cubic root of 12639625 is about 232.9403532536.

The spelling of 12639625 in words is "twelve million, six hundred thirty-nine thousand, six hundred twenty-five".