198955 has 4 divisors (see below), whose sum is σ = 238752. Its totient is φ = 159160.

The previous prime is 198953. The next prime is 198959. The reversal of 198955 is 559891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 559891 = 31 ⋅18061.

It is not a de Polignac number, because 198955 - 2¹ = 198953 is a prime.

It is a Duffinian number.

198955 is a lucky number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19891 + ... + 19900.

It is an arithmetic number, because the mean of its divisors is an integer number (59688).

2¹⁹⁸⁹⁵⁵ is an apocalyptic number.

198955 is a deficient number, since it is larger than the sum of its proper divisors (39797).

198955 is an equidigital number, since it uses as much as digits as its factorization.

198955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39796.

The product of its digits is 16200, while the sum is 37.

The square root of 198955 is about 446.0437198302. The cubic root of 198955 is about 58.3783235685.

It can be divided in two parts, 19895 and 5, that added together give a triangular number (19900 = T₁₉₉).

The spelling of 198955 in words is "one hundred ninety-eight thousand, nine hundred fifty-five".