864823 has 8 divisors (see below), whose sum is σ = 950400. Its totient is φ = 783288.

The previous prime is 864817. The next prime is 864883. The reversal of 864823 is 328468.

It is a happy number.

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

It is not a de Polignac number, because 864823 - 2¹⁷ = 733751 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 (864803) by changing a digit.

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, 553 + ... + 1426.

It is an arithmetic number, because the mean of its divisors is an integer number (118800).

2⁸⁶⁴⁸²³ is an apocalyptic number.

864823 is a deficient number, since it is larger than the sum of its proper divisors (85577).

864823 is a wasteful number, since it uses less digits than its factorization.

864823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021.

The product of its digits is 9216, while the sum is 31.

The square root of 864823 is about 929.9586012291. The cubic root of 864823 is about 95.2742949809.

The spelling of 864823 in words is "eight hundred sixty-four thousand, eight hundred twenty-three".