18381724 has 12 divisors (see below), whose sum is σ = 32201064. Its totient is φ = 9181424.

The previous prime is 18381691. The next prime is 18381731. The reversal of 18381724 is 42718381.

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 18381724.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3819 + ... + 7165.

It is an arithmetic number, because the mean of its divisors is an integer number (2683422).

Almost surely, 2^18381724 is an apocalyptic number.

It is an amenable number.

18381724 is a deficient number, since it is larger than the sum of its proper divisors (13819340).

18381724 is a wasteful number, since it uses less digits than its factorization.

18381724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4724 (or 4722 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 18381724 is about 4287.3912814204. The cubic root of 18381724 is about 263.9137880419.

The spelling of 18381724 in words is "eighteen million, three hundred eighty-one thousand, seven hundred twenty-four".