12635638 has 8 divisors (see below), whose sum is σ = 18979632. Its totient is φ = 6309096.

The previous prime is 12635633. The next prime is 12635639. The reversal of 12635638 is 83653621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12635633) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2370 + ... + 5557.

It is an arithmetic number, because the mean of its divisors is an integer number (2372454).

Almost surely, 2^12635638 is an apocalyptic number.

12635638 is a deficient number, since it is larger than the sum of its proper divisors (6343994).

12635638 is an equidigital number, since it uses as much as digits as its factorization.

12635638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8726.

The product of its digits is 25920, while the sum is 34.

The square root of 12635638 is about 3554.6642598141. The cubic root of 12635638 is about 232.9158580423.

The spelling of 12635638 in words is "twelve million, six hundred thirty-five thousand, six hundred thirty-eight".