189861 has 8 divisors (see below), whose sum is σ = 289344. Its totient is φ = 108480.

The previous prime is 189859. The next prime is 189877. The reversal of 189861 is 168981.

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

It is not a de Polignac number, because 189861 - 2¹ = 189859 is a prime.

It is a Curzon number.

189861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189851) 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, 4500 + ... + 4541.

It is an arithmetic number, because the mean of its divisors is an integer number (36168).

2¹⁸⁹⁸⁶¹ is an apocalyptic number.

It is an amenable number.

189861 is a deficient number, since it is larger than the sum of its proper divisors (99483).

189861 is an equidigital number, since it uses as much as digits as its factorization.

189861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9051.

The product of its digits is 3456, while the sum is 33.

The square root of 189861 is about 435.7304212469. The cubic root of 189861 is about 57.4749481291.

The spelling of 189861 in words is "one hundred eighty-nine thousand, eight hundred sixty-one".