189823 has 2 divisors, whose sum is σ = 189824. Its totient is φ = 189822.

The previous prime is 189817. The next prime is 189851. The reversal of 189823 is 328981.

It is a weak prime.

It is an emirp because it is prime and its reverse (328981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189823 - 2⁹ = 189311 is a prime.

189823 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94911 + 94912.

It is an arithmetic number, because the mean of its divisors is an integer number (94912).

2¹⁸⁹⁸²³ is an apocalyptic number.

189823 is a deficient number, since it is larger than the sum of its proper divisors (1).

189823 is an equidigital number, since it uses as much as digits as its factorization.

189823 is an odious number, because the sum of its binary digits is odd.

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

The square root of 189823 is about 435.6868141223. The cubic root of 189823 is about 57.4711134048.

The spelling of 189823 in words is "one hundred eighty-nine thousand, eight hundred twenty-three".