866822 has 24 divisors (see below), whose sum is σ = 1501416. Its totient is φ = 372000.

The previous prime is 866819. The next prime is 866843. The reversal of 866822 is 228668.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21122 + ... + 21162.

It is an arithmetic number, because the mean of its divisors is an integer number (62559).

2⁸⁶⁶⁸²² is an apocalyptic number.

866822 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

866822 is a deficient number, since it is larger than the sum of its proper divisors (634594).

866822 is a wasteful number, since it uses less digits than its factorization.

866822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116 (or 85 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 866822 is about 931.0327598962. The cubic root of 866822 is about 95.3476459295.

The spelling of 866822 in words is "eight hundred sixty-six thousand, eight hundred twenty-two".