13009979 has 4 divisors (see below), whose sum is σ = 13022976. Its totient is φ = 12996984.

The previous prime is 13009967. The next prime is 13010047. The reversal of 13009979 is 97990031.

It is a happy number.

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 13009979 - 2⁸ = 13009723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13009939) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4859 + ... + 7044.

It is an arithmetic number, because the mean of its divisors is an integer number (3255744).

Almost surely, 2^13009979 is an apocalyptic number.

13009979 is a deficient number, since it is larger than the sum of its proper divisors (12997).

13009979 is a wasteful number, since it uses less digits than its factorization.

13009979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12996.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 13009979 is about 3606.9348483165. The cubic root of 13009979 is about 235.1936174070.

The spelling of 13009979 in words is "thirteen million, nine thousand, nine hundred seventy-nine".