198789 has 16 divisors (see below), whose sum is σ = 287232. Its totient is φ = 121968.

The previous prime is 198769. The next prime is 198811. The reversal of 198789 is 987891.

It is not a de Polignac number, because 198789 - 2⁸ = 198533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 198789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2934 + ... + 3000.

It is an arithmetic number, because the mean of its divisors is an integer number (17952).

2¹⁹⁸⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

198789 is a deficient number, since it is larger than the sum of its proper divisors (88443).

198789 is a wasteful number, since it uses less digits than its factorization.

198789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136.

The product of its digits is 36288, while the sum is 42.

The square root of 198789 is about 445.8576005857. The cubic root of 198789 is about 58.3620828806.

It can be divided in two parts, 1 and 98789, that added together give a triangular number (98790 = T₄₄₄).

The spelling of 198789 in words is "one hundred ninety-eight thousand, seven hundred eighty-nine".