12856805 has 16 divisors (see below), whose sum is σ = 16746240. Its totient is φ = 9419328.

The previous prime is 12856759. The next prime is 12856813. The reversal of 12856805 is 50865821.

It is a happy number.

12856805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12856805 - 2⁶ = 12856741 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8324 + ... + 9746.

It is an arithmetic number, because the mean of its divisors is an integer number (1046640).

Almost surely, 2^12856805 is an apocalyptic number.

It is an amenable number.

12856805 is a deficient number, since it is larger than the sum of its proper divisors (3889435).

12856805 is a wasteful number, since it uses less digits than its factorization.

12856805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580.

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 12856805 is about 3585.6387157660. The cubic root of 12856805 is about 234.2669476448.

The spelling of 12856805 in words is "twelve million, eight hundred fifty-six thousand, eight hundred five".