189923 has 4 divisors (see below), whose sum is σ = 190920. Its totient is φ = 188928.

The previous prime is 189913. The next prime is 189929. The reversal of 189923 is 329981.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 329981 = 23 ⋅14347.

It is a cyclic number.

It is not a de Polignac number, because 189923 - 2⁶ = 189859 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 189923.

It is not an unprimeable number, because it can be changed into a prime (189929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113 + ... + 626.

It is an arithmetic number, because the mean of its divisors is an integer number (47730).

2¹⁸⁹⁹²³ is an apocalyptic number.

189923 is a deficient number, since it is larger than the sum of its proper divisors (997).

189923 is an equidigital number, since it uses as much as digits as its factorization.

189923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 996.

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

The square root of 189923 is about 435.8015603460. The cubic root of 189923 is about 57.4812036862.

The spelling of 189923 in words is "one hundred eighty-nine thousand, nine hundred twenty-three".