198789879 has 4 divisors (see below), whose sum is σ = 265053176. Its totient is φ = 132526584.

The previous prime is 198789869. The next prime is 198789901. The reversal of 198789879 is 978987891.

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

It is not a de Polignac number, because 198789879 - 2⁸ = 198789623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198789859) 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, 33131644 + ... + 33131649.

It is an arithmetic number, because the mean of its divisors is an integer number (66263294).

Almost surely, 2^198789879 is an apocalyptic number.

198789879 is a deficient number, since it is larger than the sum of its proper divisors (66263297).

198789879 is an equidigital number, since it uses as much as digits as its factorization.

198789879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66263296.

The product of its digits is 18289152, while the sum is 66.

The square root of 198789879 is about 14099.2864713077. The cubic root of 198789879 is about 583.6216890181.

The spelling of 198789879 in words is "one hundred ninety-eight million, seven hundred eighty-nine thousand, eight hundred seventy-nine".