198143 has 4 divisors (see below), whose sum is σ = 216168. Its totient is φ = 180120.

The previous prime is 198139. The next prime is 198173. The reversal of 198143 is 341891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 341891 = 11 ⋅31081.

It is a cyclic number.

It is not a de Polignac number, because 198143 - 2² = 198139 is a prime.

It is a super-3 number, since 3×198143³ = 23337667996890621, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 198143.

It is not an unprimeable number, because it can be changed into a prime (198173) 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, 8996 + ... + 9017.

It is an arithmetic number, because the mean of its divisors is an integer number (54042).

2¹⁹⁸¹⁴³ is an apocalyptic number.

198143 is a deficient number, since it is larger than the sum of its proper divisors (18025).

198143 is a wasteful number, since it uses less digits than its factorization.

198143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18024.

The product of its digits is 864, while the sum is 26.

The square root of 198143 is about 445.1325645243. The cubic root of 198143 is about 58.2987949739.

The spelling of 198143 in words is "one hundred ninety-eight thousand, one hundred forty-three".