189423 has 12 divisors (see below), whose sum is σ = 294840. Its totient is φ = 116496.

The previous prime is 189421. The next prime is 189433. The reversal of 189423 is 324981.

It is not a de Polignac number, because 189423 - 2¹ = 189421 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

189423 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189421) 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 in 11 ways as a sum of consecutive naturals, for example, 693 + ... + 926.

It is an arithmetic number, because the mean of its divisors is an integer number (24570).

2¹⁸⁹⁴²³ is an apocalyptic number.

189423 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

189423 is a deficient number, since it is larger than the sum of its proper divisors (105417).

189423 is a wasteful number, since it uses less digits than its factorization.

189423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638 (or 1635 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 189423 is about 435.2275267030. The cubic root of 189423 is about 57.4307168045.

The spelling of 189423 in words is "one hundred eighty-nine thousand, four hundred twenty-three".