866395 has 8 divisors (see below), whose sum is σ = 1045440. Its totient is φ = 689280.

The previous prime is 866389. The next prime is 866399. The reversal of 866395 is 593668.

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

It is not a de Polignac number, because 866395 - 2¹⁹ = 342107 is a prime.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (866399) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 846 + ... + 1564.

It is an arithmetic number, because the mean of its divisors is an integer number (130680).

2⁸⁶⁶³⁹⁵ is an apocalyptic number.

866395 is a deficient number, since it is larger than the sum of its proper divisors (179045).

866395 is a wasteful number, since it uses less digits than its factorization.

866395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965.

The product of its digits is 38880, while the sum is 37.

The square root of 866395 is about 930.8034164097. The cubic root of 866395 is about 95.3319871469.

The spelling of 866395 in words is "eight hundred sixty-six thousand, three hundred ninety-five".