18007224 has 32 divisors (see below), whose sum is σ = 45288720. Its totient is φ = 5966336.

The previous prime is 18007207. The next prime is 18007237. The reversal of 18007224 is 42270081.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 18007194 and 18007203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1984 + ... + 6320.

Almost surely, 2^18007224 is an apocalyptic number.

It is an amenable number.

18007224 is an abundant number, since it is smaller than the sum of its proper divisors (27281496).

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

18007224 is a wasteful number, since it uses less digits than its factorization.

18007224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4519 (or 4515 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 18007224 is about 4243.4919582815. The cubic root of 18007224 is about 262.1091944277.

The spelling of 18007224 in words is "eighteen million, seven thousand, two hundred twenty-four".