189666 has 24 divisors (see below), whose sum is σ = 422604. Its totient is φ = 61440.

The previous prime is 189661. The next prime is 189671. The reversal of 189666 is 666981.

189666 is nontrivially palindromic in base 16.

189666 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 (189661) and next prime (189671).

It can be written as a sum of positive squares in 2 ways, for example, as 189225 + 441 = 435^2 + 21^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 189666.

It is not an unprimeable number, because it can be changed into a prime (189661) by changing a digit.

189666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 610 + ... + 866.

2¹⁸⁹⁶⁶⁶ is an apocalyptic number.

189666 is an abundant number, since it is smaller than the sum of its proper divisors (232938).

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

189666 is a wasteful number, since it uses less digits than its factorization.

189666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306 (or 303 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 189666 is about 435.5066015573. The cubic root of 189666 is about 57.4552645113.

The spelling of 189666 in words is "one hundred eighty-nine thousand, six hundred sixty-six".