198859 has 2 divisors, whose sum is σ = 198860. Its totient is φ = 198858.

The previous prime is 198851. The next prime is 198899. The reversal of 198859 is 958891.

It is an a-pointer prime, because the next prime (198899) can be obtained adding 198859 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198859 - 2³ = 198851 is a prime.

It is not a weakly prime, because it can be changed into another prime (198851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99429 + 99430.

It is an arithmetic number, because the mean of its divisors is an integer number (99430).

2¹⁹⁸⁸⁵⁹ is an apocalyptic number.

198859 is a deficient number, since it is larger than the sum of its proper divisors (1).

198859 is an equidigital number, since it uses as much as digits as its factorization.

198859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 40.

The square root of 198859 is about 445.9360940763. The cubic root of 198859 is about 58.3689324655.

The spelling of 198859 in words is "one hundred ninety-eight thousand, eight hundred fifty-nine".