13979109 has 16 divisors (see below), whose sum is σ = 19482624. Its totient is φ = 8905200.

The previous prime is 13979093. The next prime is 13979111. The reversal of 13979109 is 90197931.

It is not a de Polignac number, because 13979109 - 2⁴ = 13979093 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13979149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6814 + ... + 8624.

It is an arithmetic number, because the mean of its divisors is an integer number (1217664).

Almost surely, 2^13979109 is an apocalyptic number.

It is an amenable number.

13979109 is a deficient number, since it is larger than the sum of its proper divisors (5503515).

13979109 is a wasteful number, since it uses less digits than its factorization.

13979109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1928.

The product of its (nonzero) digits is 15309, while the sum is 39.

The square root of 13979109 is about 3738.8646672486. The cubic root of 13979109 is about 240.8942851144.

The spelling of 13979109 in words is "thirteen million, nine hundred seventy-nine thousand, one hundred nine".