18180144 has 60 divisors (see below), whose sum is σ = 51222912. Its totient is φ = 6019200.

The previous prime is 18180077. The next prime is 18180161. The reversal of 18180144 is 44108181.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27174 + ... + 27834.

Almost surely, 2^18180144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18180144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25611456).

18180144 is an abundant number, since it is smaller than the sum of its proper divisors (33042768).

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

18180144 is a wasteful number, since it uses less digits than its factorization.

18180144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866 (or 857 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 18180144 is about 4263.8180073732. The cubic root of 18180144 is about 262.9455182630.

The spelling of 18180144 in words is "eighteen million, one hundred eighty thousand, one hundred forty-four".