189311866 has 8 divisors (see below), whose sum is σ = 289325844. Its totient is φ = 92869920.

The previous prime is 189311833. The next prime is 189311867. The reversal of 189311866 is 668113981.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 158231241 + 31080625 = 12579^2 + 5575^2 .

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

It is not an unprimeable number, because it can be changed into a prime (189311867) 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, 892875 + ... + 893086.

Almost surely, 2^189311866 is an apocalyptic number.

189311866 is a deficient number, since it is larger than the sum of its proper divisors (100013978).

189311866 is a wasteful number, since it uses less digits than its factorization.

189311866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786016.

The product of its digits is 62208, while the sum is 43.

The square root of 189311866 is about 13759.0648664798. The cubic root of 189311866 is about 574.1948312137.

The spelling of 189311866 in words is "one hundred eighty-nine million, three hundred eleven thousand, eight hundred sixty-six".