13979391 has 4 divisors (see below), whose sum is σ = 18639192. Its totient is φ = 9319592.

The previous prime is 13979387. The next prime is 13979393. The reversal of 13979391 is 19397931.

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 13979391 - 2² = 13979387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13979393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2329896 + ... + 2329901.

It is an arithmetic number, because the mean of its divisors is an integer number (4659798).

Almost surely, 2^13979391 is an apocalyptic number.

13979391 is a deficient number, since it is larger than the sum of its proper divisors (4659801).

13979391 is an equidigital number, since it uses as much as digits as its factorization.

13979391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4659800.

The product of its digits is 45927, while the sum is 42.

The square root of 13979391 is about 3738.9023790412. The cubic root of 13979391 is about 240.8959049538.

The spelling of 13979391 in words is "thirteen million, nine hundred seventy-nine thousand, three hundred ninety-one".