199989 has 12 divisors (see below), whose sum is σ = 299936. Its totient is φ = 133164.

The previous prime is 199967. The next prime is 199999. The reversal of 199989 is 989991.

199989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 199989 - 2¹² = 195893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199909) 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, 169 + ... + 654.

2¹⁹⁹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

199989 is a deficient number, since it is larger than the sum of its proper divisors (99947).

199989 is an frugal number, since it uses more digits than its factorization.

199989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838 (or 826 counting only the distinct ones).

The product of its digits is 52488, while the sum is 45.

The square root of 199989 is about 447.2012969570. The cubic root of 199989 is about 58.4792826048.

The spelling of 199989 in words is "one hundred ninety-nine thousand, nine hundred eighty-nine".