13987724 has 36 divisors (see below), whose sum is σ = 26795160. Its totient is φ = 6367680.

The previous prime is 13987723. The next prime is 13987733. The reversal of 13987724 is 42778931.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (13987723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 208739 + ... + 208805.

It is an arithmetic number, because the mean of its divisors is an integer number (744310).

Almost surely, 2^13987724 is an apocalyptic number.

It is an amenable number.

13987724 is a deficient number, since it is larger than the sum of its proper divisors (12807436).

13987724 is a wasteful number, since it uses less digits than its factorization.

13987724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 129 counting only the distinct ones).

The product of its digits is 84672, while the sum is 41.

The square root of 13987724 is about 3740.0165775034. The cubic root of 13987724 is about 240.9437608021.

The spelling of 13987724 in words is "thirteen million, nine hundred eighty-seven thousand, seven hundred twenty-four".