864239 has 8 divisors (see below), whose sum is σ = 898128. Its totient is φ = 831040.

The previous prime is 864223. The next prime is 864251. The reversal of 864239 is 932468.

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

It is a cyclic number.

It is not a de Polignac number, because 864239 - 2⁴ = 864223 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 (864289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4289 + ... + 4485.

It is an arithmetic number, because the mean of its divisors is an integer number (112266).

2⁸⁶⁴²³⁹ is an apocalyptic number.

864239 is a deficient number, since it is larger than the sum of its proper divisors (33889).

864239 is a wasteful number, since it uses less digits than its factorization.

864239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345.

The product of its digits is 10368, while the sum is 32.

The square root of 864239 is about 929.6445557308. The cubic root of 864239 is about 95.2528444578.

The spelling of 864239 in words is "eight hundred sixty-four thousand, two hundred thirty-nine".