12636813 has 16 divisors (see below), whose sum is σ = 19336320. Its totient is φ = 7190976.

The previous prime is 12636791. The next prime is 12636823. The reversal of 12636813 is 31863621.

It is not a de Polignac number, because 12636813 - 2⁵ = 12636781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12636823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4531 + ... + 6767.

It is an arithmetic number, because the mean of its divisors is an integer number (1208520).

Almost surely, 2^12636813 is an apocalyptic number.

It is an amenable number.

12636813 is a deficient number, since it is larger than the sum of its proper divisors (6699507).

12636813 is a wasteful number, since it uses less digits than its factorization.

12636813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2516.

The product of its digits is 5184, while the sum is 30.

The square root of 12636813 is about 3554.8295317779. The cubic root of 12636813 is about 232.9230775076.

The spelling of 12636813 in words is "twelve million, six hundred thirty-six thousand, eight hundred thirteen".