189273863 has 4 divisors (see below), whose sum is σ = 189301560. Its totient is φ = 189246168.

The previous prime is 189273853. The next prime is 189273881. The reversal of 189273863 is 368372981.

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: 368372981 = 47 ⋅7837723.

It is a cyclic number.

It is not a de Polignac number, because 189273863 - 2⁸ = 189273607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189273803) 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, 4556 + ... + 19982.

It is an arithmetic number, because the mean of its divisors is an integer number (47325390).

Almost surely, 2^189273863 is an apocalyptic number.

189273863 is a deficient number, since it is larger than the sum of its proper divisors (27697).

189273863 is a wasteful number, since it uses less digits than its factorization.

189273863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27696.

The product of its digits is 435456, while the sum is 47.

The square root of 189273863 is about 13757.6837803462. The cubic root of 189273863 is about 574.1564068103.

The spelling of 189273863 in words is "one hundred eighty-nine million, two hundred seventy-three thousand, eight hundred sixty-three".