864189818 has 4 divisors (see below), whose sum is σ = 1296284730. Its totient is φ = 432094908.

The previous prime is 864189817. The next prime is 864189853. The reversal of 864189818 is 818981468.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 695007769 + 169182049 = 26363^2 + 13007^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 864189818.

It is not an unprimeable number, because it can be changed into a prime (864189817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216047453 + ... + 216047456.

Almost surely, 2^864189818 is an apocalyptic number.

864189818 is a deficient number, since it is larger than the sum of its proper divisors (432094912).

864189818 is a wasteful number, since it uses less digits than its factorization.

864189818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432094911.

The product of its digits is 884736, while the sum is 53.

The square root of 864189818 is about 29397.1056058245. The cubic root of 864189818 is about 952.5103754470.

The spelling of 864189818 in words is "eight hundred sixty-four million, one hundred eighty-nine thousand, eight hundred eighteen".