865289 has 4 divisors (see below), whose sum is σ = 885456. Its totient is φ = 845124.

The previous prime is 865261. The next prime is 865301. The reversal of 865289 is 982568.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 865289 - 2¹⁶ = 799753 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (865259) 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, 10019 + ... + 10104.

It is an arithmetic number, because the mean of its divisors is an integer number (221364).

2⁸⁶⁵²⁸⁹ is an apocalyptic number.

It is an amenable number.

865289 is a deficient number, since it is larger than the sum of its proper divisors (20167).

865289 is a wasteful number, since it uses less digits than its factorization.

865289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20166.

The product of its digits is 34560, while the sum is 38.

The square root of 865289 is about 930.2091162744. The cubic root of 865289 is about 95.2914043969.

The spelling of 865289 in words is "eight hundred sixty-five thousand, two hundred eighty-nine".