12998009 has 4 divisors (see below), whose sum is σ = 13073316. Its totient is φ = 12922704.

The previous prime is 12997987. The next prime is 12998053. The reversal of 12998009 is 90089921.

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 11202409 + 1795600 = 3347^2 + 1340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12998009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12998099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37394 + ... + 37739.

It is an arithmetic number, because the mean of its divisors is an integer number (3268329).

Almost surely, 2^12998009 is an apocalyptic number.

It is an amenable number.

12998009 is a deficient number, since it is larger than the sum of its proper divisors (75307).

12998009 is an equidigital number, since it uses as much as digits as its factorization.

12998009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75306.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 12998009 is about 3605.2751628690. The cubic root of 12998009 is about 235.1214642942.

The spelling of 12998009 in words is "twelve million, nine hundred ninety-eight thousand, nine".