18224872 has 8 divisors (see below), whose sum is σ = 34171650. Its totient is φ = 9112432.

The previous prime is 18224863. The next prime is 18224879. The reversal of 18224872 is 27842281.

It can be written as a sum of positive squares in only one way, i.e., 17926756 + 298116 = 4234^2 + 546^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (18224879) 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 as a sum of consecutive naturals, namely, 1139047 + ... + 1139062.

Almost surely, 2^18224872 is an apocalyptic number.

It is an amenable number.

18224872 is a deficient number, since it is larger than the sum of its proper divisors (15946778).

18224872 is a wasteful number, since it uses less digits than its factorization.

18224872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2278115 (or 2278111 counting only the distinct ones).

The product of its digits is 14336, while the sum is 34.

The square root of 18224872 is about 4269.0598496625. The cubic root of 18224872 is about 263.1609803484.

The spelling of 18224872 in words is "eighteen million, two hundred twenty-four thousand, eight hundred seventy-two".