18616144 has 40 divisors (see below), whose sum is σ = 38066760. Its totient is φ = 8805888.

The previous prime is 18616133. The next prime is 18616187. The reversal of 18616144 is 44161681.

It can be written as a sum of positive squares in 4 ways, for example, as 5569600 + 13046544 = 2360^2 + 3612^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24214 + ... + 24970.

It is an arithmetic number, because the mean of its divisors is an integer number (951669).

Almost surely, 2^18616144 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 18616144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19033380).

18616144 is an abundant number, since it is smaller than the sum of its proper divisors (19450616).

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

18616144 is a wasteful number, since it uses less digits than its factorization.

18616144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847 (or 841 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 18616144 is about 4314.6429748010. The cubic root of 18616144 is about 265.0309397837.

The spelling of 18616144 in words is "eighteen million, six hundred sixteen thousand, one hundred forty-four".