866771 has 4 divisors (see below), whose sum is σ = 876600. Its totient is φ = 856944.

The previous prime is 866759. The next prime is 866777. The reversal of 866771 is 177668.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 866771 - 2⁶ = 866707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4781 + ... + 4958.

It is an arithmetic number, because the mean of its divisors is an integer number (219150).

2⁸⁶⁶⁷⁷¹ is an apocalyptic number.

866771 is a deficient number, since it is larger than the sum of its proper divisors (9829).

866771 is an equidigital number, since it uses as much as digits as its factorization.

866771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9828.

The product of its digits is 14112, while the sum is 35.

The square root of 866771 is about 931.0053705538. The cubic root of 866771 is about 95.3457759473.

The spelling of 866771 in words is "eight hundred sixty-six thousand, seven hundred seventy-one".