18219180 has 72 divisors (see below), whose sum is σ = 59352048. Its totient is φ = 4163712.

The previous prime is 18219169. The next prime is 18219191. The reversal of 18219180 is 8191281.

It is an interprime number because it is at equal distance from previous prime (18219169) and next prime (18219191).

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

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, 159 + ... + 6038.

It is an arithmetic number, because the mean of its divisors is an integer number (824334).

Almost surely, 2^18219180 is an apocalyptic number.

18219180 is a gapful number since it is divisible by the number (10) 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 18219180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29676024).

18219180 is an abundant number, since it is smaller than the sum of its proper divisors (41132868).

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

18219180 is a wasteful number, since it uses less digits than its factorization.

18219180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6223 (or 6214 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 18219180 is about 4268.3931402812. The cubic root of 18219180 is about 263.1335806448.

The spelling of 18219180 in words is "eighteen million, two hundred nineteen thousand, one hundred eighty".