198775 has 6 divisors (see below), whose sum is σ = 246512. Its totient is φ = 159000.

The previous prime is 198769. The next prime is 198811. The reversal of 198775 is 577891.

198775 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 198775 - 2⁷ = 198647 is a prime.

It is an Ulam number.

It is a Duffinian number.

198775 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3951 + ... + 4000.

2¹⁹⁸⁷⁷⁵ is an apocalyptic number.

198775 is a deficient number, since it is larger than the sum of its proper divisors (47737).

198775 is an equidigital number, since it uses as much as digits as its factorization.

198775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7961 (or 7956 counting only the distinct ones).

The product of its digits is 17640, while the sum is 37.

The square root of 198775 is about 445.8419002292. The cubic root of 198775 is about 58.3607127707.

The spelling of 198775 in words is "one hundred ninety-eight thousand, seven hundred seventy-five".