12639605 has 16 divisors (see below), whose sum is σ = 16761600. Its totient is φ = 9072960.

The previous prime is 12639577. The next prime is 12639637. The reversal of 12639605 is 50693621.

It is a happy number.

It is not a de Polignac number, because 12639605 - 2¹⁰ = 12638581 is a prime.

It is a super-2 number, since 2×12639605² = 319519229112050, which contains 22 as substring.

It is a Curzon number.

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 in 15 ways as a sum of consecutive naturals, for example, 2891 + ... + 5799.

It is an arithmetic number, because the mean of its divisors is an integer number (1047600).

Almost surely, 2^12639605 is an apocalyptic number.

It is an amenable number.

12639605 is a deficient number, since it is larger than the sum of its proper divisors (4121995).

12639605 is a wasteful number, since it uses less digits than its factorization.

12639605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3004.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 12639605 is about 3555.2222152771. Note that the first 4 decimals coincide. The cubic root of 12639605 is about 232.9402303911.

The spelling of 12639605 in words is "twelve million, six hundred thirty-nine thousand, six hundred five".