18228180 has 24 divisors (see below), whose sum is σ = 51039072. Its totient is φ = 4860832.

The previous prime is 18228157. The next prime is 18228191. The reversal of 18228180 is 8182281.

It is a super-2 number, since 2×18228180² = 664533092224800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151842 + ... + 151961.

It is an arithmetic number, because the mean of its divisors is an integer number (2126628).

Almost surely, 2^18228180 is an apocalyptic number.

18228180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18228180 is an abundant number, since it is smaller than the sum of its proper divisors (32810892).

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

18228180 is a wasteful number, since it uses less digits than its factorization.

18228180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303815 (or 303813 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 18228180 is about 4269.4472710176. The cubic root of 18228180 is about 263.1769015184.

The spelling of 18228180 in words is "eighteen million, two hundred twenty-eight thousand, one hundred eighty".