198823 has 2 divisors, whose sum is σ = 198824. Its totient is φ = 198822.

The previous prime is 198817. The next prime is 198827. The reversal of 198823 is 328891.

It is a strong prime.

It is an emirp because it is prime and its reverse (328891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198823 - 2¹⁷ = 67751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99411 + 99412.

It is an arithmetic number, because the mean of its divisors is an integer number (99412).

2¹⁹⁸⁸²³ is an apocalyptic number.

198823 is a deficient number, since it is larger than the sum of its proper divisors (1).

198823 is an equidigital number, since it uses as much as digits as its factorization.

198823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 31.

The square root of 198823 is about 445.8957277212. The cubic root of 198823 is about 58.3654100226.

The spelling of 198823 in words is "one hundred ninety-eight thousand, eight hundred twenty-three".