189923143 has 4 divisors (see below), whose sum is σ = 196049728. Its totient is φ = 183796560.

The previous prime is 189923113. The next prime is 189923159. The reversal of 189923143 is 341329981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 341329981 = 181 ⋅1885801.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189923143 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 189923096 and 189923105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189923113) 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, 3063246 + ... + 3063307.

It is an arithmetic number, because the mean of its divisors is an integer number (49012432).

Almost surely, 2^189923143 is an apocalyptic number.

189923143 is a deficient number, since it is larger than the sum of its proper divisors (6126585).

189923143 is an equidigital number, since it uses as much as digits as its factorization.

189923143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6126584.

The product of its digits is 46656, while the sum is 40.

The square root of 189923143 is about 13781.2605736921. The cubic root of 189923143 is about 574.8121811273.

The spelling of 189923143 in words is "one hundred eighty-nine million, nine hundred twenty-three thousand, one hundred forty-three".