198923 has 4 divisors (see below), whose sum is σ = 201960. Its totient is φ = 195888.

The previous prime is 198901. The next prime is 198929. The reversal of 198923 is 329891.

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

It is a cyclic number.

It is not a de Polignac number, because 198923 - 2⁶ = 198859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198923.

It is not an unprimeable number, because it can be changed into a prime (198929) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1418 + ... + 1551.

It is an arithmetic number, because the mean of its divisors is an integer number (50490).

2¹⁹⁸⁹²³ is an apocalyptic number.

198923 is a deficient number, since it is larger than the sum of its proper divisors (3037).

198923 is an equidigital number, since it uses as much as digits as its factorization.

198923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3036.

The product of its digits is 3888, while the sum is 32.

The square root of 198923 is about 446.0078474646. The cubic root of 198923 is about 58.3751935366.

Subtracting from 198923 its sum of digits (32), we obtain a palindrome (198891).

The spelling of 198923 in words is "one hundred ninety-eight thousand, nine hundred twenty-three".