18318224 has 10 divisors (see below), whose sum is σ = 35491590. Its totient is φ = 9159104.

The previous prime is 18318221. The next prime is 18318233. The reversal of 18318224 is 42281381.

It can be written as a sum of positive squares in only one way, i.e., 18215824 + 102400 = 4268^2 + 320^2 .

It is not an unprimeable number, because it can be changed into a prime (18318221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 572429 + ... + 572460.

It is an arithmetic number, because the mean of its divisors is an integer number (3549159).

Almost surely, 2^18318224 is an apocalyptic number.

It is an amenable number.

18318224 is a deficient number, since it is larger than the sum of its proper divisors (17173366).

18318224 is a wasteful number, since it uses less digits than its factorization.

18318224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1144897 (or 1144891 counting only the distinct ones).

The product of its digits is 3072, while the sum is 29.

The square root of 18318224 is about 4279.9794392030. The cubic root of 18318224 is about 263.6095391005.

The spelling of 18318224 in words is "eighteen million, three hundred eighteen thousand, two hundred twenty-four".