18289224 has 48 divisors (see below), whose sum is σ = 49736700. Its totient is φ = 6071424.

The previous prime is 18289217. The next prime is 18289231. The reversal of 18289224 is 42298281.

It is an interprime number because it is at equal distance from previous prime (18289217) and next prime (18289231).

It can be written as a sum of positive squares in 2 ways, for example, as 16892100 + 1397124 = 4110^2 + 1182^2 .

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

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27682 + ... + 28334.

Almost surely, 2^18289224 is an apocalyptic number.

It is an amenable number.

18289224 is an abundant number, since it is smaller than the sum of its proper divisors (31447476).

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

18289224 is a wasteful number, since it uses less digits than its factorization.

18289224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1054 (or 1047 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 18289224 is about 4276.5902305458. The cubic root of 18289224 is about 263.4703568606.

The spelling of 18289224 in words is "eighteen million, two hundred eighty-nine thousand, two hundred twenty-four".