18189318 has 16 divisors (see below), whose sum is σ = 41575680. Its totient is φ = 5196936.

The previous prime is 18189317. The next prime is 18189323. The reversal of 18189318 is 81398181.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18189313) 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, 216498 + ... + 216581.

It is an arithmetic number, because the mean of its divisors is an integer number (2598480).

Almost surely, 2^18189318 is an apocalyptic number.

18189318 is an abundant number, since it is smaller than the sum of its proper divisors (23386362).

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

18189318 is a wasteful number, since it uses less digits than its factorization.

18189318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433091.

The product of its digits is 13824, while the sum is 39.

The square root of 18189318 is about 4264.8936680766. The cubic root of 18189318 is about 262.9897397049.

The spelling of 18189318 in words is "eighteen million, one hundred eighty-nine thousand, three hundred eighteen".