198958 has 8 divisors (see below), whose sum is σ = 308160. Its totient is φ = 96240.

The previous prime is 198953. The next prime is 198959. The reversal of 198958 is 859891.

198958 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 198958.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198953) by changing a digit.

198958 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1543 + ... + 1666.

It is an arithmetic number, because the mean of its divisors is an integer number (38520).

2¹⁹⁸⁹⁵⁸ is an apocalyptic number.

198958 is a deficient number, since it is larger than the sum of its proper divisors (109202).

198958 is a wasteful number, since it uses less digits than its factorization.

198958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3242.

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

The square root of 198958 is about 446.0470827166. The cubic root of 198958 is about 58.3786169918.

It can be divided in two parts, 198 and 958, that added together give a square (1156 = 34²).

The spelling of 198958 in words is "one hundred ninety-eight thousand, nine hundred fifty-eight".