198989 has 12 divisors (see below), whose sum is σ = 240768. Its totient is φ = 163800.

The previous prime is 198977. The next prime is 198997. The reversal of 198989 is 989891.

It is not a de Polignac number, because 198989 - 2⁸ = 198733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1454 + ... + 1584.

It is an arithmetic number, because the mean of its divisors is an integer number (20064).

2¹⁹⁸⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

198989 is a deficient number, since it is larger than the sum of its proper divisors (41779).

198989 is a wasteful number, since it uses less digits than its factorization.

198989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 169 counting only the distinct ones).

The product of its digits is 46656, while the sum is 44.

The square root of 198989 is about 446.0818310579. The cubic root of 198989 is about 58.3816488597.

The spelling of 198989 in words is "one hundred ninety-eight thousand, nine hundred eighty-nine".