864863 has 4 divisors (see below), whose sum is σ = 873528. Its totient is φ = 856200.

The previous prime is 864817. The next prime is 864883. The reversal of 864863 is 368468.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864863 is a prime.

It is an Ulam number.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4181 + ... + 4382.

It is an arithmetic number, because the mean of its divisors is an integer number (218382).

2⁸⁶⁴⁸⁶³ is an apocalyptic number.

864863 is a deficient number, since it is larger than the sum of its proper divisors (8665).

864863 is a wasteful number, since it uses less digits than its factorization.

864863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8664.

The product of its digits is 27648, while the sum is 35.

The square root of 864863 is about 929.9801073141. The cubic root of 864863 is about 95.2757638414.

The spelling of 864863 in words is "eight hundred sixty-four thousand, eight hundred sixty-three".