18397724 has 12 divisors (see below), whose sum is σ = 32558400. Its totient is φ = 9095328.

The previous prime is 18397721. The next prime is 18397747. The reversal of 18397724 is 42779381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18397721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25484 + ... + 26195.

It is an arithmetic number, because the mean of its divisors is an integer number (2713200).

Almost surely, 2^18397724 is an apocalyptic number.

It is an amenable number.

18397724 is a deficient number, since it is larger than the sum of its proper divisors (14160676).

18397724 is a wasteful number, since it uses less digits than its factorization.

18397724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51772 (or 51770 counting only the distinct ones).

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

The square root of 18397724 is about 4289.2568120830. The cubic root of 18397724 is about 263.9903386425.

The spelling of 18397724 in words is "eighteen million, three hundred ninety-seven thousand, seven hundred twenty-four".