866305 has 16 divisors (see below), whose sum is σ = 1195200. Its totient is φ = 596160.

The previous prime is 866293. The next prime is 866309. The reversal of 866305 is 503668.

It is not a de Polignac number, because 866305 - 2¹³ = 858113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (866309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 631 + ... + 1459.

It is an arithmetic number, because the mean of its divisors is an integer number (74700).

It is a Proth number, since it is equal to 423 ⋅ 2¹¹ + 1 and 423 < 2¹¹.

2⁸⁶⁶³⁰⁵ is an apocalyptic number.

It is an amenable number.

866305 is a deficient number, since it is larger than the sum of its proper divisors (328895).

866305 is a wasteful number, since it uses less digits than its factorization.

866305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 866305 is about 930.7550698223. The cubic root of 866305 is about 95.3286860445.

The spelling of 866305 in words is "eight hundred sixty-six thousand, three hundred five".