13977665 has 16 divisors (see below), whose sum is σ = 18144000. Its totient is φ = 10276032.

The previous prime is 13977647. The next prime is 13977671. The reversal of 13977665 is 56677931.

It is not a de Polignac number, because 13977665 - 2¹⁴ = 13961281 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, 23036 + ... + 23634.

It is an arithmetic number, because the mean of its divisors is an integer number (1134000).

Almost surely, 2^13977665 is an apocalyptic number.

It is an amenable number.

13977665 is a deficient number, since it is larger than the sum of its proper divisors (4166335).

13977665 is a wasteful number, since it uses less digits than its factorization.

13977665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976.

The product of its digits is 238140, while the sum is 44.

The square root of 13977665 is about 3738.6715555127. The cubic root of 13977665 is about 240.8859902766.

The spelling of 13977665 in words is "thirteen million, nine hundred seventy-seven thousand, six hundred sixty-five".