189288863 has 4 divisors (see below), whose sum is σ = 200423520. Its totient is φ = 178154208.

The previous prime is 189288859. The next prime is 189288901. The reversal of 189288863 is 368882981.

189288863 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 368882981 = 31 ⋅11899451.

It is a cyclic number.

It is not a de Polignac number, because 189288863 - 2² = 189288859 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 (189288563) 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, 5567303 + ... + 5567336.

It is an arithmetic number, because the mean of its divisors is an integer number (50105880).

Almost surely, 2^189288863 is an apocalyptic number.

189288863 is a deficient number, since it is larger than the sum of its proper divisors (11134657).

189288863 is a wasteful number, since it uses less digits than its factorization.

189288863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11134656.

The product of its digits is 1327104, while the sum is 53.

The square root of 189288863 is about 13758.2289194504. The cubic root of 189288863 is about 574.1715737550.

The spelling of 189288863 in words is "one hundred eighty-nine million, two hundred eighty-eight thousand, eight hundred sixty-three".