18221190 has 64 divisors (see below), whose sum is σ = 49593600. Its totient is φ = 4247424.

The previous prime is 18221173. The next prime is 18221213. The reversal of 18221190 is 9112281.

It is a super-2 number, since 2×18221190² = 664023530032200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18221190.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6181 + ... + 8639.

It is an arithmetic number, because the mean of its divisors is an integer number (774900).

Almost surely, 2^18221190 is an apocalyptic number.

18221190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18221190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24796800).

18221190 is an abundant number, since it is smaller than the sum of its proper divisors (31372410).

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

18221190 is a wasteful number, since it uses less digits than its factorization.

18221190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2501.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 18221190 is about 4268.6285853890. The cubic root of 18221190 is about 263.1432568770.

The spelling of 18221190 in words is "eighteen million, two hundred twenty-one thousand, one hundred ninety".