18360189 has 10 divisors (see below), whose sum is σ = 27427070. Its totient is φ = 12240072.

The previous prime is 18360149. The next prime is 18360193. The reversal of 18360189 is 98106381.

It can be written as a sum of positive squares in only one way, i.e., 17288964 + 1071225 = 4158^2 + 1035^2 .

It is not a de Polignac number, because 18360189 - 2¹⁹ = 17835901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18360149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 113254 + ... + 113415.

It is an arithmetic number, because the mean of its divisors is an integer number (2742707).

Almost surely, 2^18360189 is an apocalyptic number.

It is an amenable number.

18360189 is a deficient number, since it is larger than the sum of its proper divisors (9066881).

18360189 is an equidigital number, since it uses as much as digits as its factorization.

18360189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226681 (or 226672 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18360189 is about 4284.8791114803. The cubic root of 18360189 is about 263.8106855560.

The spelling of 18360189 in words is "eighteen million, three hundred sixty thousand, one hundred eighty-nine".