13864665 has 16 divisors (see below), whose sum is σ = 22284288. Its totient is φ = 7360896.

The previous prime is 13864649. The next prime is 13864679. The reversal of 13864665 is 56646831.

It is not a de Polignac number, because 13864665 - 2⁴ = 13864649 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1512 + ... + 5478.

It is an arithmetic number, because the mean of its divisors is an integer number (1392768).

Almost surely, 2^13864665 is an apocalyptic number.

13864665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13864665 is a deficient number, since it is larger than the sum of its proper divisors (8419623).

13864665 is a wasteful number, since it uses less digits than its factorization.

13864665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4208.

The product of its digits is 103680, while the sum is 39.

The square root of 13864665 is about 3723.5285684415. The cubic root of 13864665 is about 240.2350994869.

The spelling of 13864665 in words is "thirteen million, eight hundred sixty-four thousand, six hundred sixty-five".