189138 has 16 divisors (see below), whose sum is σ = 391680. Its totient is φ = 60816.

The previous prime is 189127. The next prime is 189139. The reversal of 189138 is 831981.

189138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189139) 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, 370 + ... + 717.

It is an arithmetic number, because the mean of its divisors is an integer number (24480).

2¹⁸⁹¹³⁸ is an apocalyptic number.

189138 is an abundant number, since it is smaller than the sum of its proper divisors (202542).

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

189138 is a wasteful number, since it uses less digits than its factorization.

189138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121.

The product of its digits is 1728, while the sum is 30.

The square root of 189138 is about 434.8999885031. The cubic root of 189138 is about 57.4018995191.

The spelling of 189138 in words is "one hundred eighty-nine thousand, one hundred thirty-eight".