13638724 has 24 divisors (see below), whose sum is σ = 27171648. Its totient is φ = 5929440.

The previous prime is 13638707. The next prime is 13638739. The reversal of 13638724 is 42783631.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 13638724.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5727 + ... + 7750.

It is an arithmetic number, because the mean of its divisors is an integer number (1132152).

Almost surely, 2^13638724 is an apocalyptic number.

It is an amenable number.

13638724 is a deficient number, since it is larger than the sum of its proper divisors (13532924).

13638724 is a wasteful number, since it uses less digits than its factorization.

13638724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13515 (or 13513 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 13638724 is about 3693.0643102984. The cubic root of 13638724 is about 238.9229748930.

The spelling of 13638724 in words is "thirteen million, six hundred thirty-eight thousand, seven hundred twenty-four".