13391239 has 4 divisors (see below), whose sum is σ = 13579920. Its totient is φ = 13202560.

The previous prime is 13391237. The next prime is 13391251. The reversal of 13391239 is 93219331.

13391239 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.

It is a cyclic number.

It is not a de Polignac number, because 13391239 - 2¹ = 13391237 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13391239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13391237) 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, 94234 + ... + 94375.

It is an arithmetic number, because the mean of its divisors is an integer number (3394980).

Almost surely, 2^13391239 is an apocalyptic number.

13391239 is a deficient number, since it is larger than the sum of its proper divisors (188681).

13391239 is an equidigital number, since it uses as much as digits as its factorization.

13391239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188680.

The product of its digits is 4374, while the sum is 31.

The square root of 13391239 is about 3659.4041864763. The cubic root of 13391239 is about 237.4689983542.

The spelling of 13391239 in words is "thirteen million, three hundred ninety-one thousand, two hundred thirty-nine".