12786857 has 4 divisors (see below), whose sum is σ = 12828816. Its totient is φ = 12744900.

The previous prime is 12786847. The next prime is 12786863. The reversal of 12786857 is 75868721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75868721 = 2441 ⋅31081.

It is a cyclic number.

It is not a de Polignac number, because 12786857 - 2¹² = 12782761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12786817) 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, 20519 + ... + 21132.

It is an arithmetic number, because the mean of its divisors is an integer number (3207204).

Almost surely, 2^12786857 is an apocalyptic number.

It is an amenable number.

12786857 is a deficient number, since it is larger than the sum of its proper divisors (41959).

12786857 is an equidigital number, since it uses as much as digits as its factorization.

12786857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41958.

The product of its digits is 188160, while the sum is 44.

The square root of 12786857 is about 3575.8715021656. The cubic root of 12786857 is about 233.8413283778.

The spelling of 12786857 in words is "twelve million, seven hundred eighty-six thousand, eight hundred fifty-seven".