866505 has 16 divisors (see below), whose sum is σ = 1410624. Its totient is φ = 454080.

The previous prime is 866477. The next prime is 866513. The reversal of 866505 is 505668.

866505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 866505 - 2⁹ = 865993 is a prime.

866505 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 442 + ... + 1388.

It is an arithmetic number, because the mean of its divisors is an integer number (88164).

2⁸⁶⁶⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

866505 is a deficient number, since it is larger than the sum of its proper divisors (544119).

866505 is a wasteful number, since it uses less digits than its factorization.

866505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1016.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 866505 is about 930.8625032732. The cubic root of 866505 is about 95.3360215172.

The spelling of 866505 in words is "eight hundred sixty-six thousand, five hundred five".