13957309 has 4 divisors (see below), whose sum is σ = 13991040. Its totient is φ = 13923580.

The previous prime is 13957303. The next prime is 13957319. The reversal of 13957309 is 90375931.

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 a de Polignac number, because none of the positive numbers 2^k-13957309 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 (13957303) 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, 16237 + ... + 17074.

It is an arithmetic number, because the mean of its divisors is an integer number (3497760).

Almost surely, 2^13957309 is an apocalyptic number.

It is an amenable number.

13957309 is a deficient number, since it is larger than the sum of its proper divisors (33731).

13957309 is an equidigital number, since it uses as much as digits as its factorization.

13957309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33730.

The product of its (nonzero) digits is 25515, while the sum is 37.

The square root of 13957309 is about 3735.9482062791. The cubic root of 13957309 is about 240.7689975006.

The spelling of 13957309 in words is "thirteen million, nine hundred fifty-seven thousand, three hundred nine".