13979309 has 8 divisors (see below), whose sum is σ = 14355480. Its totient is φ = 13608000.

The previous prime is 13979297. The next prime is 13979327. The reversal of 13979309 is 90397931.

It can be written as a sum of positive squares in 4 ways, for example, as 126025 + 13853284 = 355^2 + 3722^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 13979309 - 2¹⁶ = 13913773 is a prime.

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 5027 + ... + 7295.

It is an arithmetic number, because the mean of its divisors is an integer number (1794435).

Almost surely, 2^13979309 is an apocalyptic number.

It is an amenable number.

13979309 is a deficient number, since it is larger than the sum of its proper divisors (376171).

13979309 is a wasteful number, since it uses less digits than its factorization.

13979309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2431.

The product of its (nonzero) digits is 45927, while the sum is 41.

The square root of 13979309 is about 3738.8914132400. The cubic root of 13979309 is about 240.8954339389.

The spelling of 13979309 in words is "thirteen million, nine hundred seventy-nine thousand, three hundred nine".