189723 has 4 divisors (see below), whose sum is σ = 252968. Its totient is φ = 126480.

The previous prime is 189713. The next prime is 189733. The reversal of 189723 is 327981.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (189713) and next prime (189733).

It is not a de Polignac number, because 189723 - 2⁵ = 189691 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189713) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31618 + ... + 31623.

It is an arithmetic number, because the mean of its divisors is an integer number (63242).

2¹⁸⁹⁷²³ is an apocalyptic number.

189723 is a deficient number, since it is larger than the sum of its proper divisors (63245).

189723 is an equidigital number, since it uses as much as digits as its factorization.

189723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63244.

The product of its digits is 3024, while the sum is 30.

The square root of 189723 is about 435.5720376700. The cubic root of 189723 is about 57.4610195791.

The spelling of 189723 in words is "one hundred eighty-nine thousand, seven hundred twenty-three".