12911806 has 16 divisors (see below), whose sum is σ = 20590416. Its totient is φ = 6051456.

The previous prime is 12911777. The next prime is 12911819. The reversal of 12911806 is 60811921.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9820 + ... + 11056.

It is an arithmetic number, because the mean of its divisors is an integer number (1286901).

Almost surely, 2^12911806 is an apocalyptic number.

12911806 is a deficient number, since it is larger than the sum of its proper divisors (7678610).

12911806 is a wasteful number, since it uses less digits than its factorization.

12911806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 12911806 is about 3593.3001544541. The cubic root of 12911806 is about 234.6005345709.

It can be divided in two parts, 129 and 11806, that added together give a triangular number (11935 = T₁₅₄).

The spelling of 12911806 in words is "twelve million, nine hundred eleven thousand, eight hundred six".