864989823 has 8 divisors (see below), whose sum is σ = 1153472688. Its totient is φ = 576583424.

The previous prime is 864989813. The next prime is 864989831. The reversal of 864989823 is 328989468.

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 864989823 - 2⁵ = 864989791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864989803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17065 + ... + 44957.

It is an arithmetic number, because the mean of its divisors is an integer number (144184086).

Almost surely, 2^864989823 is an apocalyptic number.

864989823 is a deficient number, since it is larger than the sum of its proper divisors (288482865).

864989823 is a wasteful number, since it uses less digits than its factorization.

864989823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38233.

The product of its digits is 5971968, while the sum is 57.

The square root of 864989823 is about 29410.7093250061. The cubic root of 864989823 is about 952.8042067438.

The spelling of 864989823 in words is "eight hundred sixty-four million, nine hundred eighty-nine thousand, eight hundred twenty-three".