189889 has 4 divisors (see below), whose sum is σ = 217024. Its totient is φ = 162756.

The previous prime is 189887. The next prime is 189901. The reversal of 189889 is 988981.

189889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 988981 = 7 ⋅141283.

It is a cyclic number.

It is not a de Polignac number, because 189889 - 2¹ = 189887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13557 + ... + 13570.

It is an arithmetic number, because the mean of its divisors is an integer number (54256).

2¹⁸⁹⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

189889 is a deficient number, since it is larger than the sum of its proper divisors (27135).

189889 is an equidigital number, since it uses as much as digits as its factorization.

189889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27134.

The product of its digits is 41472, while the sum is 43.

The square root of 189889 is about 435.7625500201. The cubic root of 189889 is about 57.4777733880.

Adding to 189889 its product of digits (41472), we get a square (231361 = 481²).

The spelling of 189889 in words is "one hundred eighty-nine thousand, eight hundred eighty-nine".