320865 has 8 divisors (see below), whose sum is σ = 513408. Its totient is φ = 171120.

The previous prime is 320861. The next prime is 320867. The reversal of 320865 is 568023.

320865 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 320865 - 2² = 320861 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

320865 is strictly pandigital in base 7.

It is a nialpdrome in base 15.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320865.

It is not an unprimeable number, because it can be changed into a prime (320861) 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, 10681 + ... + 10710.

It is an arithmetic number, because the mean of its divisors is an integer number (64176).

2³²⁰⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

320865 is a deficient number, since it is larger than the sum of its proper divisors (192543).

320865 is a wasteful number, since it uses less digits than its factorization.

320865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21399.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 320865 is about 566.4494681788. The cubic root of 320865 is about 68.4606128018.

Adding to 320865 its reverse (568023), we get a palindrome (888888).

The spelling of 320865 in words is "three hundred twenty thousand, eight hundred sixty-five".