198723 has 8 divisors (see below), whose sum is σ = 302848. Its totient is φ = 113544.

The previous prime is 198719. The next prime is 198733. The reversal of 198723 is 327891.

It is a happy number.

198723 is nontrivially palindromic in base 2.

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

It is not a de Polignac number, because 198723 - 2² = 198719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198733) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4711 + ... + 4752.

It is an arithmetic number, because the mean of its divisors is an integer number (37856).

198723 is a Friedman number, since it can be written as (91^2*8-7)*3, using all its digits and the basic arithmetic operations.

2¹⁹⁸⁷²³ is an apocalyptic number.

198723 is a deficient number, since it is larger than the sum of its proper divisors (104125).

198723 is an equidigital number, since it uses as much as digits as its factorization.

198723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9473.

The product of its digits is 3024, while the sum is 30.

The square root of 198723 is about 445.7835797783. The cubic root of 198723 is about 58.3556232277.

The spelling of 198723 in words is "one hundred ninety-eight thousand, seven hundred twenty-three".