12812909 has 12 divisors (see below), whose sum is σ = 13676796. Its totient is φ = 11998272.

The previous prime is 12812893. The next prime is 12812963. The reversal of 12812909 is 90921821.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10220809 + 2592100 = 3197^2 + 1610^2 .

It is not a de Polignac number, because 12812909 - 2⁴ = 12812893 is a prime.

It is a Duffinian 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 11 ways as a sum of consecutive naturals, for example, 27809 + ... + 28265.

It is an arithmetic number, because the mean of its divisors is an integer number (1139733).

Almost surely, 2^12812909 is an apocalyptic number.

It is an amenable number.

12812909 is a deficient number, since it is larger than the sum of its proper divisors (863887).

12812909 is an equidigital number, since it uses as much as digits as its factorization.

12812909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556 (or 533 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 12812909 is about 3579.5123969614. The cubic root of 12812909 is about 234.0000304381. Note that the first 4 decimals are identical.

The spelling of 12812909 in words is "twelve million, eight hundred twelve thousand, nine hundred nine".