13979779 has 8 divisors (see below), whose sum is σ = 15372288. Its totient is φ = 12607560.

The previous prime is 13979759. The next prime is 13979783. The reversal of 13979779 is 97797931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13979779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13979759) 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, 3607 + ... + 6400.

It is an arithmetic number, because the mean of its divisors is an integer number (1921536).

Almost surely, 2^13979779 is an apocalyptic number.

13979779 is a deficient number, since it is larger than the sum of its proper divisors (1392509).

13979779 is a wasteful number, since it uses less digits than its factorization.

13979779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10145.

The product of its digits is 750141, while the sum is 52.

The square root of 13979779 is about 3738.9542655668. The cubic root of 13979779 is about 240.8981336333.

It can be divided in two parts, 139797 and 79, that added together give a square (139876 = 374²).

The spelling of 13979779 in words is "thirteen million, nine hundred seventy-nine thousand, seven hundred seventy-nine".