198558 has 16 divisors (see below), whose sum is σ = 441360. Its totient is φ = 66168.

The previous prime is 198553. The next prime is 198571. The reversal of 198558 is 855891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198553) 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, 1785 + ... + 1892.

It is an arithmetic number, because the mean of its divisors is an integer number (27585).

2¹⁹⁸⁵⁵⁸ is an apocalyptic number.

198558 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

198558 is an abundant number, since it is smaller than the sum of its proper divisors (242802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198558 is a wasteful number, since it uses less digits than its factorization.

198558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3688 (or 3682 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 198558 is about 445.5984739651. The cubic root of 198558 is about 58.3394678356.

The spelling of 198558 in words is "one hundred ninety-eight thousand, five hundred fifty-eight".