866622 has 16 divisors (see below), whose sum is σ = 1774080. Its totient is φ = 282072.

The previous prime is 866581. The next prime is 866623. The reversal of 866622 is 226668.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 866622.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866623) by changing a digit.

866622 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1422 + ... + 1937.

It is an arithmetic number, because the mean of its divisors is an integer number (110880).

2⁸⁶⁶⁶²² is an apocalyptic number.

866622 is an abundant number, since it is smaller than the sum of its proper divisors (907458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866622 is a wasteful number, since it uses less digits than its factorization.

866622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3407.

The product of its digits is 6912, while the sum is 30.

The square root of 866622 is about 930.9253460939. The cubic root of 866622 is about 95.3403122455.

The spelling of 866622 in words is "eight hundred sixty-six thousand, six hundred twenty-two".