12806909 has 4 divisors (see below), whose sum is σ = 12987360. Its totient is φ = 12626460.

The previous prime is 12806903. The next prime is 12806923. The reversal of 12806909 is 90960821.

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 12806909 - 2²⁰ = 11758333 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 (12806903) 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, 90119 + ... + 90260.

It is an arithmetic number, because the mean of its divisors is an integer number (3246840).

Almost surely, 2^12806909 is an apocalyptic number.

It is an amenable number.

12806909 is a deficient number, since it is larger than the sum of its proper divisors (180451).

12806909 is an equidigital number, since it uses as much as digits as its factorization.

12806909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180450.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 12806909 is about 3578.6741958440. The cubic root of 12806909 is about 233.9634990671.

The spelling of 12806909 in words is "twelve million, eight hundred six thousand, nine hundred nine".