13856636 has 12 divisors (see below), whose sum is σ = 24384360. Its totient is φ = 6889680.

The previous prime is 13856629. The next prime is 13856639. The reversal of 13856636 is 63665831.

It is a super-2 number, since 2×13856636² = 384012722472992, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13856636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13856639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8846 + ... + 10293.

It is an arithmetic number, because the mean of its divisors is an integer number (2032030).

Almost surely, 2^13856636 is an apocalyptic number.

It is an amenable number.

13856636 is a deficient number, since it is larger than the sum of its proper divisors (10527724).

13856636 is a wasteful number, since it uses less digits than its factorization.

13856636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19324 (or 19322 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 13856636 is about 3722.4502683045. The cubic root of 13856636 is about 240.1887173093.

The spelling of 13856636 in words is "thirteen million, eight hundred fifty-six thousand, six hundred thirty-six".