18397224 has 24 divisors (see below), whose sum is σ = 49826010. Its totient is φ = 6132384.

The previous prime is 18397207. The next prime is 18397231. The reversal of 18397224 is 42279381.

It can be written as a sum of positive squares in only one way, i.e., 14062500 + 4334724 = 3750^2 + 2082^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 127687 + ... + 127830.

Almost surely, 2^18397224 is an apocalyptic number.

It is an amenable number.

18397224 is an abundant number, since it is smaller than the sum of its proper divisors (31428786).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18397224 is a wasteful number, since it uses less digits than its factorization.

18397224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255529 (or 255522 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 18397224 is about 4289.1985265315. The cubic root of 18397224 is about 263.9879471081.

The spelling of 18397224 in words is "eighteen million, three hundred ninety-seven thousand, two hundred twenty-four".