18944538 has 16 divisors (see below), whose sum is σ = 38110176. Its totient is φ = 6278000.

The previous prime is 18944537. The next prime is 18944551. The reversal of 18944538 is 83544981.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18944538.

It is not an unprimeable number, because it can be changed into a prime (18944533) 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, 8088 + ... + 10163.

It is an arithmetic number, because the mean of its divisors is an integer number (2381886).

Almost surely, 2^18944538 is an apocalyptic number.

18944538 is an abundant number, since it is smaller than the sum of its proper divisors (19165638).

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

18944538 is a wasteful number, since it uses less digits than its factorization.

18944538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18429.

The product of its digits is 138240, while the sum is 42.

The square root of 18944538 is about 4352.5323663357. The cubic root of 18944538 is about 266.5802716654.

The spelling of 18944538 in words is "eighteen million, nine hundred forty-four thousand, five hundred thirty-eight".