18557224 has 64 divisors (see below), whose sum is σ = 42508800. Its totient is φ = 7418304.

The previous prime is 18557221. The next prime is 18557233. The reversal of 18557224 is 42275581.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18557224.

It is not an unprimeable number, because it can be changed into a prime (18557221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113767 + ... + 113929.

It is an arithmetic number, because the mean of its divisors is an integer number (664200).

Almost surely, 2^18557224 is an apocalyptic number.

18557224 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 18557224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21254400).

18557224 is an abundant number, since it is smaller than the sum of its proper divisors (23951576).

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

18557224 is a wasteful number, since it uses less digits than its factorization.

18557224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302 (or 298 counting only the distinct ones).

The product of its digits is 22400, while the sum is 34.

The square root of 18557224 is about 4307.8096522479. The cubic root of 18557224 is about 264.7510370918.

It can be divided in two parts, 18557 and 224, that added together give a palindrome (18781).

The spelling of 18557224 in words is "eighteen million, five hundred fifty-seven thousand, two hundred twenty-four".