12806857 has 4 divisors (see below), whose sum is σ = 14636416. Its totient is φ = 10977300.

The previous prime is 12806749. The next prime is 12806861. The reversal of 12806857 is 75860821.

12806857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 12806857 - 2¹¹ = 12804809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12806887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 914769 + ... + 914782.

It is an arithmetic number, because the mean of its divisors is an integer number (3659104).

Almost surely, 2^12806857 is an apocalyptic number.

It is an amenable number.

12806857 is a deficient number, since it is larger than the sum of its proper divisors (1829559).

12806857 is an equidigital number, since it uses as much as digits as its factorization.

12806857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829558.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 12806857 is about 3578.6669305762. Note that the first 3 decimals coincide. The cubic root of 12806857 is about 233.9631824121.

The spelling of 12806857 in words is "twelve million, eight hundred six thousand, eight hundred fifty-seven".