864443 has 4 divisors (see below), whose sum is σ = 909960. Its totient is φ = 818928.

The previous prime is 864439. The next prime is 864449. The reversal of 864443 is 344468.

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

It is a cyclic number.

It is not a de Polignac number, because 864443 - 2² = 864439 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864449) 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 3 ways as a sum of consecutive naturals, for example, 22730 + ... + 22767.

It is an arithmetic number, because the mean of its divisors is an integer number (227490).

2⁸⁶⁴⁴⁴³ is an apocalyptic number.

864443 is a deficient number, since it is larger than the sum of its proper divisors (45517).

864443 is a wasteful number, since it uses less digits than its factorization.

864443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45516.

The product of its digits is 9216, while the sum is 29.

The square root of 864443 is about 929.7542686108. The cubic root of 864443 is about 95.2603385466.

The spelling of 864443 in words is "eight hundred sixty-four thousand, four hundred forty-three".