866365 has 4 divisors (see below), whose sum is σ = 1039644. Its totient is φ = 693088.

The previous prime is 866353. The next prime is 866389. The reversal of 866365 is 563668.

866365 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 599076 + 267289 = 774^2 + 517^2 .

It is a cyclic number.

It is not a de Polignac number, because 866365 - 2¹⁵ = 833597 is a prime.

It is a Duffinian number.

866365 is a lucky number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 866365.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86632 + ... + 86641.

It is an arithmetic number, because the mean of its divisors is an integer number (259911).

2⁸⁶⁶³⁶⁵ is an apocalyptic number.

It is an amenable number.

866365 is a deficient number, since it is larger than the sum of its proper divisors (173279).

866365 is a wasteful number, since it uses less digits than its factorization.

866365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173278.

The product of its digits is 25920, while the sum is 34.

The square root of 866365 is about 930.7873011596. The cubic root of 866365 is about 95.3308868048.

The spelling of 866365 in words is "eight hundred sixty-six thousand, three hundred sixty-five".