198779 has 8 divisors (see below), whose sum is σ = 230880. Its totient is φ = 167616.

The previous prime is 198769. The next prime is 198811. The reversal of 198779 is 977891.

198779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 198779 - 2¹² = 194683 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 317 + ... + 705.

It is an arithmetic number, because the mean of its divisors is an integer number (28860).

2¹⁹⁸⁷⁷⁹ is an apocalyptic number.

198779 is a deficient number, since it is larger than the sum of its proper divisors (32101).

198779 is an equidigital number, since it uses as much as digits as its factorization.

198779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469.

The product of its digits is 31752, while the sum is 41.

The square root of 198779 is about 445.8463861018. The cubic root of 198779 is about 58.3611042373.

The spelling of 198779 in words is "one hundred ninety-eight thousand, seven hundred seventy-nine".