866289 has 8 divisors (see below), whose sum is σ = 1183392. Its totient is φ = 563360.

The previous prime is 866279. The next prime is 866293. The reversal of 866289 is 982668.

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

It is a cyclic number.

It is not a de Polignac number, because 866289 - 2⁷ = 866161 is a prime.

It is a d-powerful number, because it can be written as 8² + 6⁶ + 2¹² + 6⁷ + 8⁴ + 9⁶ .

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 866289.

It is not an unprimeable number, because it can be changed into a prime (866279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3399 + ... + 3644.

It is an arithmetic number, because the mean of its divisors is an integer number (147924).

2⁸⁶⁶²⁸⁹ is an apocalyptic number.

It is an amenable number.

866289 is a deficient number, since it is larger than the sum of its proper divisors (317103).

866289 is a wasteful number, since it uses less digits than its factorization.

866289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7087.

The product of its digits is 41472, while the sum is 39.

The square root of 866289 is about 930.7464746106. The cubic root of 866289 is about 95.3280991579.

The spelling of 866289 in words is "eight hundred sixty-six thousand, two hundred eighty-nine".