864259 has 4 divisors (see below), whose sum is σ = 942840. Its totient is φ = 785680.

The previous prime is 864251. The next prime is 864277. The reversal of 864259 is 952468.

It is a happy number.

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 864259 - 2³ = 864251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39274 + ... + 39295.

It is an arithmetic number, because the mean of its divisors is an integer number (235710).

2⁸⁶⁴²⁵⁹ is an apocalyptic number.

864259 is a deficient number, since it is larger than the sum of its proper divisors (78581).

864259 is a wasteful number, since it uses less digits than its factorization.

864259 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78580.

The product of its digits is 17280, while the sum is 34.

The square root of 864259 is about 929.6553124680. The cubic root of 864259 is about 95.2535792245.

Subtracting 864259 from its reverse (952468), we obtain a square (88209 = 297²).

The spelling of 864259 in words is "eight hundred sixty-four thousand, two hundred fifty-nine".