12856717 has 4 divisors (see below), whose sum is σ = 12881916. Its totient is φ = 12831520.

The previous prime is 12856703. The next prime is 12856721. The reversal of 12856717 is 71765821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71765821 = 5857 ⋅12253.

It can be written as a sum of positive squares in 2 ways, for example, as 7502121 + 5354596 = 2739^2 + 2314^2 .

It is a cyclic number.

It is not a de Polignac number, because 12856717 - 2⁷ = 12856589 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 (12856757) 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 3 ways as a sum of consecutive naturals, for example, 11818 + ... + 12859.

It is an arithmetic number, because the mean of its divisors is an integer number (3220479).

Almost surely, 2^12856717 is an apocalyptic number.

It is an amenable number.

12856717 is a deficient number, since it is larger than the sum of its proper divisors (25199).

12856717 is an equidigital number, since it uses as much as digits as its factorization.

12856717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25198.

The product of its digits is 23520, while the sum is 37.

The square root of 12856717 is about 3585.6264445700. The cubic root of 12856717 is about 234.2664131539.

The spelling of 12856717 in words is "twelve million, eight hundred fifty-six thousand, seven hundred seventeen".