198879 has 4 divisors (see below), whose sum is σ = 265176. Its totient is φ = 132584.

The previous prime is 198859. The next prime is 198899. The reversal of 198879 is 978891.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (198859) and next prime (198899).

It is a cyclic number.

It is not a de Polignac number, because 198879 - 2⁸ = 198623 is a prime.

It is a D-number.

198879 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 198879.

It is a congruent 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, 33144 + ... + 33149.

It is an arithmetic number, because the mean of its divisors is an integer number (66294).

2¹⁹⁸⁸⁷⁹ is an apocalyptic number.

198879 is a deficient number, since it is larger than the sum of its proper divisors (66297).

198879 is an equidigital number, since it uses as much as digits as its factorization.

198879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66296.

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

The square root of 198879 is about 445.9585182503. The cubic root of 198879 is about 58.3708891945.

The spelling of 198879 in words is "one hundred ninety-eight thousand, eight hundred seventy-nine".