198889 has 4 divisors (see below), whose sum is σ = 202320. Its totient is φ = 195460.

The previous prime is 198859. The next prime is 198899. The reversal of 198889 is 988891.

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: 988891 = 101 ⋅9791.

It is a cyclic number.

It is not a de Polignac number, because 198889 - 2⁷ = 198761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (198829) 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, 1627 + ... + 1744.

It is an arithmetic number, because the mean of its divisors is an integer number (50580).

2¹⁹⁸⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

198889 is a deficient number, since it is larger than the sum of its proper divisors (3431).

198889 is an equidigital number, since it uses as much as digits as its factorization.

198889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3430.

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

The square root of 198889 is about 445.9697299145. The cubic root of 198889 is about 58.3718675098.

The spelling of 198889 in words is "one hundred ninety-eight thousand, eight hundred eighty-nine".