12986656 has 24 divisors (see below), whose sum is σ = 25990524. Its totient is φ = 6385920.

The previous prime is 12986653. The next prime is 12986669. The reversal of 12986656 is 65668921.

It can be written as a sum of positive squares in 2 ways, for example, as 8643600 + 4343056 = 2940^2 + 2084^2 .

It is not an unprimeable number, because it can be changed into a prime (12986653) 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, 1375 + ... + 5278.

Almost surely, 2^12986656 is an apocalyptic number.

12986656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12986656 is an abundant number, since it is smaller than the sum of its proper divisors (13003868).

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

12986656 is an equidigital number, since it uses as much as digits as its factorization.

12986656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6724 (or 6716 counting only the distinct ones).

The product of its digits is 155520, while the sum is 43.

The square root of 12986656 is about 3603.7003205039. The cubic root of 12986656 is about 235.0529894088.

The spelling of 12986656 in words is "twelve million, nine hundred eighty-six thousand, six hundred fifty-six".