13391665 has 32 divisors (see below), whose sum is σ = 19782144. Its totient is φ = 8494080.

The previous prime is 13391641. The next prime is 13391683. The reversal of 13391665 is 56619331.

13391665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13391665 - 2⁹ = 13391153 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 13391665.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42087 + ... + 42403.

It is an arithmetic number, because the mean of its divisors is an integer number (618192).

Almost surely, 2^13391665 is an apocalyptic number.

It is an amenable number.

13391665 is a deficient number, since it is larger than the sum of its proper divisors (6390479).

13391665 is a wasteful number, since it uses less digits than its factorization.

13391665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417.

The product of its digits is 14580, while the sum is 34.

The square root of 13391665 is about 3659.4623922101. The cubic root of 13391665 is about 237.4715164363.

The spelling of 13391665 in words is "thirteen million, three hundred ninety-one thousand, six hundred sixty-five".