13663975 has 12 divisors (see below), whose sum is σ = 18247096. Its totient is φ = 10090080.

The previous prime is 13663967. The next prime is 13663997. The reversal of 13663975 is 57936631.

It is not a de Polignac number, because 13663975 - 2³ = 13663967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20697 + ... + 21346.

Almost surely, 2^13663975 is an apocalyptic number.

13663975 is a deficient number, since it is larger than the sum of its proper divisors (4583121).

13663975 is a wasteful number, since it uses less digits than its factorization.

13663975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42066 (or 42061 counting only the distinct ones).

The product of its digits is 102060, while the sum is 40.

The square root of 13663975 is about 3696.4814350947. The cubic root of 13663975 is about 239.0703328773.

The spelling of 13663975 in words is "thirteen million, six hundred sixty-three thousand, nine hundred seventy-five".