198659 has 2 divisors, whose sum is σ = 198660. Its totient is φ = 198658.

The previous prime is 198647. The next prime is 198673. The reversal of 198659 is 956891.

198659 is nontrivially palindromic in base 16.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198659 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99329 + 99330.

It is an arithmetic number, because the mean of its divisors is an integer number (99330).

2¹⁹⁸⁶⁵⁹ is an apocalyptic number.

198659 is a deficient number, since it is larger than the sum of its proper divisors (1).

198659 is an equidigital number, since it uses as much as digits as its factorization.

198659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 38.

The square root of 198659 is about 445.7117902861. The cubic root of 198659 is about 58.3493579558.

The spelling of 198659 in words is "one hundred ninety-eight thousand, six hundred fifty-nine".