865320 has 32 divisors (see below), whose sum is σ = 2596320. Its totient is φ = 230720.

The previous prime is 865313. The next prime is 865321. The reversal of 865320 is 23568.

865320 = T₄₁₁ + T₄₁₂ + ... + T₄₂₀.

865320 is nontrivially palindromic in base 11.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (865321) by changing a digit.

865320 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3486 + ... + 3725.

It is an arithmetic number, because the mean of its divisors is an integer number (81135).

2⁸⁶⁵³²⁰ is an apocalyptic number.

It is an amenable number.

865320 is an abundant number, since it is smaller than the sum of its proper divisors (1731000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

865320 is a wasteful number, since it uses less digits than its factorization.

865320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7225 (or 7221 counting only the distinct ones).

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

The square root of 865320 is about 930.2257790451. The cubic root of 865320 is about 95.2925423590.

Adding to 865320 its reverse (23568), we get a palindrome (888888).

The spelling of 865320 in words is "eight hundred sixty-five thousand, three hundred twenty".