189165 has 8 divisors (see below), whose sum is σ = 302688. Its totient is φ = 100880.

The previous prime is 189151. The next prime is 189169. The reversal of 189165 is 561981.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 189165 - 2⁴ = 189149 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6291 + ... + 6320.

It is an arithmetic number, because the mean of its divisors is an integer number (37836).

2¹⁸⁹¹⁶⁵ is an apocalyptic number.

189165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

189165 is a deficient number, since it is larger than the sum of its proper divisors (113523).

189165 is a wasteful number, since it uses less digits than its factorization.

189165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12619.

The product of its digits is 2160, while the sum is 30.

The square root of 189165 is about 434.9310290149. The cubic root of 189165 is about 57.4046308185.

Subtracting 189165 from its reverse (561981), we obtain a triangular number (372816 = T₈₆₃).

The spelling of 189165 in words is "one hundred eighty-nine thousand, one hundred sixty-five".