864523 has 4 divisors (see below), whose sum is σ = 943128. Its totient is φ = 785920.

The previous prime is 864511. The next prime is 864533. The reversal of 864523 is 325468.

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 864523 - 2⁵ = 864491 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 864491 and 864500.

It is not an unprimeable number, because it can be changed into a prime (864503) 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, 39286 + ... + 39307.

It is an arithmetic number, because the mean of its divisors is an integer number (235782).

2⁸⁶⁴⁵²³ is an apocalyptic number.

864523 is a deficient number, since it is larger than the sum of its proper divisors (78605).

864523 is a wasteful number, since it uses less digits than its factorization.

864523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78604.

The product of its digits is 5760, while the sum is 28.

The square root of 864523 is about 929.7972897358. The cubic root of 864523 is about 95.2632770832.

It can be divided in two parts, 8645 and 23, that added together give a palindrome (8668).

The spelling of 864523 in words is "eight hundred sixty-four thousand, five hundred twenty-three".