189018 has 12 divisors (see below), whose sum is σ = 409578. Its totient is φ = 63000.

The previous prime is 189017. The next prime is 189019. The reversal of 189018 is 810981.

189018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (189017) and next prime (189019).

It can be written as a sum of positive squares in only one way, i.e., 173889 + 15129 = 417^2 + 123^2 .

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 188982 and 189000.

It is not an unprimeable number, because it can be changed into a prime (189011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5233 + ... + 5268.

2¹⁸⁹⁰¹⁸ is an apocalyptic number.

189018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

189018 is an abundant number, since it is smaller than the sum of its proper divisors (220560).

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

189018 is a wasteful number, since it uses less digits than its factorization.

189018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10509 (or 10506 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 189018 is about 434.7620038596. The cubic root of 189018 is about 57.3897572646.

Adding to 189018 its reverse (810981), we get a palindrome (999999).

The spelling of 189018 in words is "one hundred eighty-nine thousand, eighteen".