12856671 has 16 divisors (see below), whose sum is σ = 19247200. Its totient is φ = 8481024.

The previous prime is 12856667. The next prime is 12856681. The reversal of 12856671 is 17665821.

12856671 is a `hidden beast` number, since 1 + 28 + 566 + 71 = 666.

It is not a de Polignac number, because 12856671 - 2² = 12856667 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12856601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165 + ... + 5073.

It is an arithmetic number, because the mean of its divisors is an integer number (1202950).

Almost surely, 2^12856671 is an apocalyptic number.

12856671 is a deficient number, since it is larger than the sum of its proper divisors (6390529).

12856671 is an equidigital number, since it uses as much as digits as its factorization.

12856671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5015 (or 5009 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 12856671 is about 3585.6200300645. The cubic root of 12856671 is about 234.2661337599.

The spelling of 12856671 in words is "twelve million, eight hundred fifty-six thousand, six hundred seventy-one".