866071 has 4 divisors (see below), whose sum is σ = 869152. Its totient is φ = 862992.

The previous prime is 866057. The next prime is 866081. The reversal of 866071 is 170668.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866011) 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, 1071 + ... + 1696.

It is an arithmetic number, because the mean of its divisors is an integer number (217288).

2⁸⁶⁶⁰⁷¹ is an apocalyptic number.

866071 is a deficient number, since it is larger than the sum of its proper divisors (3081).

866071 is a wasteful number, since it uses less digits than its factorization.

866071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3080.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 866071 is about 930.6293569408. The cubic root of 866071 is about 95.3201021080.

The spelling of 866071 in words is "eight hundred sixty-six thousand, seventy-one".