189288865 has 8 divisors (see below), whose sum is σ = 227385000. Its totient is φ = 151272192.

The previous prime is 189288859. The next prime is 189288901. The reversal of 189288865 is 568882981.

It can be written as a sum of positive squares in 4 ways, for example, as 58232161 + 131056704 = 7631^2 + 11448^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189288865 - 2¹⁹ = 188764577 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14490 + ... + 24259.

It is an arithmetic number, because the mean of its divisors is an integer number (28423125).

Almost surely, 2^189288865 is an apocalyptic number.

It is an amenable number.

189288865 is a deficient number, since it is larger than the sum of its proper divisors (38096135).

189288865 is an equidigital number, since it uses as much as digits as its factorization.

189288865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39731.

The product of its digits is 2211840, while the sum is 55.

The square root of 189288865 is about 13758.2289921341. The cubic root of 189288865 is about 574.1715757772.

The spelling of 189288865 in words is "one hundred eighty-nine million, two hundred eighty-eight thousand, eight hundred sixty-five".