12509979 has 8 divisors (see below), whose sum is σ = 16759872. Its totient is φ = 8300040.

The previous prime is 12509971. The next prime is 12509983. The reversal of 12509979 is 97990521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12509979 - 2³ = 12509971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12509979.

It is not an unprimeable number, because it can be changed into a prime (12509971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9249 + ... + 10514.

It is an arithmetic number, because the mean of its divisors is an integer number (2094984).

Almost surely, 2^12509979 is an apocalyptic number.

12509979 is a deficient number, since it is larger than the sum of its proper divisors (4249893).

12509979 is a wasteful number, since it uses less digits than its factorization.

12509979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19977.

The product of its (nonzero) digits is 51030, while the sum is 42.

The square root of 12509979 is about 3536.9448681030. The cubic root of 12509979 is about 232.1411831404.

The spelling of 12509979 in words is "twelve million, five hundred nine thousand, nine hundred seventy-nine".