12992809 has 4 divisors (see below), whose sum is σ = 13344004. Its totient is φ = 12641616.

The previous prime is 12992807. The next prime is 12992831. The reversal of 12992809 is 90829921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7997584 + 4995225 = 2828^2 + 2235^2 .

It is a cyclic number.

It is not a de Polignac number, because 12992809 - 2¹ = 12992807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12992807) 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, 175542 + ... + 175615.

It is an arithmetic number, because the mean of its divisors is an integer number (3336001).

Almost surely, 2^12992809 is an apocalyptic number.

It is an amenable number.

12992809 is a deficient number, since it is larger than the sum of its proper divisors (351195).

12992809 is an equidigital number, since it uses as much as digits as its factorization.

12992809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351194.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 12992809 is about 3604.5539252451. The cubic root of 12992809 is about 235.0901057814.

The spelling of 12992809 in words is "twelve million, nine hundred ninety-two thousand, eight hundred nine".