18159144 has 64 divisors (see below), whose sum is σ = 48176640. Its totient is φ = 5691840.

The previous prime is 18159143. The next prime is 18159157. The reversal of 18159144 is 44195181.

It is not an unprimeable number, because it can be changed into a prime (18159143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36739 + ... + 37229.

It is an arithmetic number, because the mean of its divisors is an integer number (752760).

Almost surely, 2^18159144 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 18159144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24088320).

18159144 is an abundant number, since it is smaller than the sum of its proper divisors (30017496).

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

18159144 is a wasteful number, since it uses less digits than its factorization.

18159144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 590 (or 586 counting only the distinct ones).

The product of its digits is 5760, while the sum is 33.

The square root of 18159144 is about 4261.3547141725. The cubic root of 18159144 is about 262.8442359087.

The spelling of 18159144 in words is "eighteen million, one hundred fifty-nine thousand, one hundred forty-four".