18158224 has 120 divisors (see below), whose sum is σ = 45800640. Its totient is φ = 6918912.

The previous prime is 18158209. The next prime is 18158233. The reversal of 18158224 is 42285181.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 342582 + ... + 342634.

It is an arithmetic number, because the mean of its divisors is an integer number (381672).

Almost surely, 2^18158224 is an apocalyptic number.

18158224 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18158224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22900320).

18158224 is an abundant number, since it is smaller than the sum of its proper divisors (27642416).

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

18158224 is a wasteful number, since it uses less digits than its factorization.

18158224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117 (or 104 counting only the distinct ones).

The product of its digits is 5120, while the sum is 31.

The square root of 18158224 is about 4261.2467659125. The cubic root of 18158224 is about 262.8397969920.

The spelling of 18158224 in words is "eighteen million, one hundred fifty-eight thousand, two hundred twenty-four".