866397 has 8 divisors (see below), whose sum is σ = 1320256. Its totient is φ = 495072.

The previous prime is 866389. The next prime is 866399. The reversal of 866397 is 793668.

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

It is not a de Polignac number, because 866397 - 2³ = 866389 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 866397.

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, 20608 + ... + 20649.

It is an arithmetic number, because the mean of its divisors is an integer number (165032).

2⁸⁶⁶³⁹⁷ is an apocalyptic number.

It is an amenable number.

866397 is a deficient number, since it is larger than the sum of its proper divisors (453859).

866397 is a wasteful number, since it uses less digits than its factorization.

866397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41267.

The product of its digits is 54432, while the sum is 39.

The square root of 866397 is about 930.8044907498. The cubic root of 866397 is about 95.3320605021.

The spelling of 866397 in words is "eight hundred sixty-six thousand, three hundred ninety-seven".