12981256 has 32 divisors (see below), whose sum is σ = 26258400. Its totient is φ = 5996160.

The previous prime is 12981253. The next prime is 12981263. The reversal of 12981256 is 65218921.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (12981253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5191 + ... + 7273.

It is an arithmetic number, because the mean of its divisors is an integer number (820575).

Almost surely, 2^12981256 is an apocalyptic number.

It is an amenable number.

12981256 is an abundant number, since it is smaller than the sum of its proper divisors (13277144).

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

12981256 is a wasteful number, since it uses less digits than its factorization.

12981256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149 (or 2145 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The square root of 12981256 is about 3602.9510127117. The cubic root of 12981256 is about 235.0204056522.

The spelling of 12981256 in words is "twelve million, nine hundred eighty-one thousand, two hundred fifty-six".