13979409 has 4 divisors (see below), whose sum is σ = 18639216. Its totient is φ = 9319604.

The previous prime is 13979393. The next prime is 13979411. The reversal of 13979409 is 90497931.

13979409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13979409 - 2⁴ = 13979393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13979209) 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, 2329899 + ... + 2329904.

It is an arithmetic number, because the mean of its divisors is an integer number (4659804).

Almost surely, 2^13979409 is an apocalyptic number.

It is an amenable number.

13979409 is a deficient number, since it is larger than the sum of its proper divisors (4659807).

13979409 is an equidigital number, since it uses as much as digits as its factorization.

13979409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4659806.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 13979409 is about 3738.9047861640. The cubic root of 13979409 is about 240.8960083470.

The spelling of 13979409 in words is "thirteen million, nine hundred seventy-nine thousand, four hundred nine".