13665979 has 8 divisors (see below), whose sum is σ = 14307840. Its totient is φ = 13028136.

The previous prime is 13665961. The next prime is 13665983. The reversal of 13665979 is 97956631.

13665979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 13665979 - 2⁷ = 13665851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13665919) 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, 7632 + ... + 9250.

It is an arithmetic number, because the mean of its divisors is an integer number (1788480).

Almost surely, 2^13665979 is an apocalyptic number.

13665979 is a deficient number, since it is larger than the sum of its proper divisors (641861).

13665979 is a wasteful number, since it uses less digits than its factorization.

13665979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009.

The product of its digits is 306180, while the sum is 46.

The square root of 13665979 is about 3696.7524937437. The cubic root of 13665979 is about 239.0820198993.

The spelling of 13665979 in words is "thirteen million, six hundred sixty-five thousand, nine hundred seventy-nine".