12981636 has 36 divisors (see below), whose sum is σ = 34543600. Its totient is φ = 4099248.

The previous prime is 12981623. The next prime is 12981643. The reversal of 12981636 is 63618921.

12981636 is a `hidden beast` number, since 12 + 9 + 8 + 1 + 636 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 12981636.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8806 + ... + 10173.

Almost surely, 2^12981636 is an apocalyptic number.

It is an amenable number.

12981636 is an abundant number, since it is smaller than the sum of its proper divisors (21561964).

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

12981636 is a wasteful number, since it uses less digits than its factorization.

12981636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19008 (or 19003 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 12981636 is about 3603.0037468757. The cubic root of 12981636 is about 235.0226988788.

The spelling of 12981636 in words is "twelve million, nine hundred eighty-one thousand, six hundred thirty-six".