12891256 has 32 divisors (see below), whose sum is σ = 27780480. Its totient is φ = 5493600.

The previous prime is 12891251. The next prime is 12891259. The reversal of 12891256 is 65219821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12891251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11271 + ... + 12361.

It is an arithmetic number, because the mean of its divisors is an integer number (868140).

Almost surely, 2^12891256 is an apocalyptic number.

It is an amenable number.

12891256 is an abundant number, since it is smaller than the sum of its proper divisors (14889224).

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

12891256 is a wasteful number, since it uses less digits than its factorization.

12891256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315 (or 1311 counting only the distinct ones).

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

The square root of 12891256 is about 3590.4395274117. The cubic root of 12891256 is about 234.4760076866.

The spelling of 12891256 in words is "twelve million, eight hundred ninety-one thousand, two hundred fifty-six".