198623 has 2 divisors, whose sum is σ = 198624. Its totient is φ = 198622.

The previous prime is 198613. The next prime is 198637. The reversal of 198623 is 326891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198623 - 2¹⁰ = 197599 is a prime.

It is a super-2 number, since 2×198623² = 78902192258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99311 + 99312.

It is an arithmetic number, because the mean of its divisors is an integer number (99312).

2¹⁹⁸⁶²³ is an apocalyptic number.

198623 is a deficient number, since it is larger than the sum of its proper divisors (1).

198623 is an equidigital number, since it uses as much as digits as its factorization.

198623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 198623 is about 445.6714036148. The cubic root of 198623 is about 58.3458331490.

The spelling of 198623 in words is "one hundred ninety-eight thousand, six hundred twenty-three".