198839 has 2 divisors, whose sum is σ = 198840. Its totient is φ = 198838.

The previous prime is 198833. The next prime is 198841. The reversal of 198839 is 938891.

198839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 198839 - 2⁴ = 198823 is a prime.

Together with 198841, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99419 + 99420.

It is an arithmetic number, because the mean of its divisors is an integer number (99420).

2¹⁹⁸⁸³⁹ is an apocalyptic number.

198839 is a deficient number, since it is larger than the sum of its proper divisors (1).

198839 is an equidigital number, since it uses as much as digits as its factorization.

198839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 38.

The square root of 198839 is about 445.9136687746. The cubic root of 198839 is about 58.3669756053.

The spelling of 198839 in words is "one hundred ninety-eight thousand, eight hundred thirty-nine".