18440224 has 24 divisors (see below), whose sum is σ = 39605328. Its totient is φ = 8381760.

The previous prime is 18440179. The next prime is 18440231. The reversal of 18440224 is 42204481.

It is a super-2 number, since 2×18440224² = 680083722340352, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25842 + ... + 26545.

It is an arithmetic number, because the mean of its divisors is an integer number (1650222).

Almost surely, 2^18440224 is an apocalyptic number.

It is an amenable number.

18440224 is an abundant number, since it is smaller than the sum of its proper divisors (21165104).

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

18440224 is a wasteful number, since it uses less digits than its factorization.

18440224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52408 (or 52400 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 25.

The square root of 18440224 is about 4294.2081924378. The cubic root of 18440224 is about 264.1934608896.

The spelling of 18440224 in words is "eighteen million, four hundred forty thousand, two hundred twenty-four".