18112180 has 24 divisors (see below), whose sum is σ = 38236968. Its totient is φ = 7206528.

The previous prime is 18112169. The next prime is 18112183. The reversal of 18112180 is 8121181.

It can be written as a sum of positive squares in 4 ways, for example, as 2572816 + 15539364 = 1604^2 + 3942^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18112183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1642 + ... + 6238.

It is an arithmetic number, because the mean of its divisors is an integer number (1593207).

Almost surely, 2^18112180 is an apocalyptic number.

18112180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18112180 is an abundant number, since it is smaller than the sum of its proper divisors (20124788).

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

18112180 is a wasteful number, since it uses less digits than its factorization.

18112180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4803 (or 4801 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 22.

The square root of 18112180 is about 4255.8406925072. The cubic root of 18112180 is about 262.6174470664.

Subtracting from 18112180 its reverse (8121181), we obtain a palindrome (9990999).

The spelling of 18112180 in words is "eighteen million, one hundred twelve thousand, one hundred eighty".