198158 has 4 divisors (see below), whose sum is σ = 297240. Its totient is φ = 99078.

The previous prime is 198139. The next prime is 198173. The reversal of 198158 is 851891.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49538 + ... + 49541.

It is an arithmetic number, because the mean of its divisors is an integer number (74310).

2¹⁹⁸¹⁵⁸ is an apocalyptic number.

198158 is a deficient number, since it is larger than the sum of its proper divisors (99082).

198158 is an equidigital number, since it uses as much as digits as its factorization.

198158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99081.

The product of its digits is 2880, while the sum is 32.

The square root of 198158 is about 445.1494131188. The cubic root of 198158 is about 58.3002660660.

The spelling of 198158 in words is "one hundred ninety-eight thousand, one hundred fifty-eight".