18072318 has 64 divisors (see below), whose sum is σ = 41601024. Its totient is φ = 5227200.

The previous prime is 18072293. The next prime is 18072323. The reversal of 18072318 is 81327081.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 247530 + ... + 247602.

It is an arithmetic number, because the mean of its divisors is an integer number (650016).

Almost surely, 2^18072318 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18072318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20800512).

18072318 is an abundant number, since it is smaller than the sum of its proper divisors (23528706).

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

18072318 is a wasteful number, since it uses less digits than its factorization.

18072318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 18072318 is about 4251.1549019061. The cubic root of 18072318 is about 262.4246459444.

Adding to 18072318 its reverse (81327081), we get a palindrome (99399399).

The spelling of 18072318 in words is "eighteen million, seventy-two thousand, three hundred eighteen".