12499979 has 4 divisors (see below), whose sum is σ = 12765984. Its totient is φ = 12233976.

The previous prime is 12499919. The next prime is 12499987. The reversal of 12499979 is 97999421.

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

It is a cyclic number.

It is not a de Polignac number, because 12499979 - 2²⁰ = 11451403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12499909) 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, 132932 + ... + 133025.

It is an arithmetic number, because the mean of its divisors is an integer number (3191496).

Almost surely, 2^12499979 is an apocalyptic number.

12499979 is a deficient number, since it is larger than the sum of its proper divisors (266005).

12499979 is an equidigital number, since it uses as much as digits as its factorization.

12499979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266004.

The product of its digits is 367416, while the sum is 50.

The square root of 12499979 is about 3535.5309360830. The cubic root of 12499979 is about 232.0793117161.

The spelling of 12499979 in words is "twelve million, four hundred ninety-nine thousand, nine hundred seventy-nine".