189665 has 8 divisors (see below), whose sum is σ = 260160. Its totient is φ = 130032.

The previous prime is 189661. The next prime is 189671. The reversal of 189665 is 566981.

189665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 189665 - 2² = 189661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 5419 = 189665 / (1 + 8 + 9 + 6 + 6 + 5).

It is not an unprimeable number, because it can be changed into a prime (189661) 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, 2675 + ... + 2744.

It is an arithmetic number, because the mean of its divisors is an integer number (32520).

2¹⁸⁹⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

189665 is a deficient number, since it is larger than the sum of its proper divisors (70495).

189665 is an equidigital number, since it uses as much as digits as its factorization.

189665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5431.

The product of its digits is 12960, while the sum is 35.

The square root of 189665 is about 435.5054534676. The cubic root of 189665 is about 57.4551635349.

It can be divided in two parts, 18966 and 5, that multiplied together give a triangular number (94830 = T₄₃₅).

The spelling of 189665 in words is "one hundred eighty-nine thousand, six hundred sixty-five".