13213656 has 24 divisors (see below), whose sum is σ = 35787180. Its totient is φ = 4404528.

The previous prime is 13213579. The next prime is 13213667. The reversal of 13213656 is 65631231.

13213656 is a `hidden beast` number, since 1 + 3 + 2 + 1 + 3 + 656 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91690 + ... + 91833.

Almost surely, 2^13213656 is an apocalyptic number.

It is an amenable number.

13213656 is an abundant number, since it is smaller than the sum of its proper divisors (22573524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13213656 is a wasteful number, since it uses less digits than its factorization.

13213656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183535 (or 183528 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 13213656 is about 3635.0592842483. The cubic root of 13213656 is about 236.4146211335.

Adding to 13213656 its reverse (65631231), we get a palindrome (78844887).

The spelling of 13213656 in words is "thirteen million, two hundred thirteen thousand, six hundred fifty-six".