189189 has 48 divisors (see below), whose sum is σ = 383040. Its totient is φ = 90720.

The previous prime is 189187. The next prime is 189199. The reversal of 189189 is 981981.

189189 = 4³ + 5³ + ... + 29³.

It is not a de Polignac number, because 189189 - 2¹ = 189187 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189187) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14547 + ... + 14559.

It is an arithmetic number, because the mean of its divisors is an integer number (7980).

2¹⁸⁹¹⁸⁹ is an apocalyptic number.

It is an amenable number.

189189 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

189189 is a wasteful number, since it uses less digits than its factorization.

189189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47 (or 34 counting only the distinct ones).

The product of its digits is 5184, while the sum is 36.

The square root of 189189 is about 434.9586187214. The cubic root of 189189 is about 57.4070584221.

Adding to 189189 its sum of digits (36), we get a square (189225 = 435²).

It can be divided in two parts, 189 and 189, that added together give a triangular number (378 = T₂₇).

The spelling of 189189 in words is "one hundred eighty-nine thousand, one hundred eighty-nine".