816222 has 32 divisors (see below), whose sum is σ = 1814400. Its totient is φ = 242720.

The previous prime is 816217. The next prime is 816223. The reversal of 816222 is 222618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816223) by changing a digit.

816222 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5404 + ... + 5552.

It is an arithmetic number, because the mean of its divisors is an integer number (56700).

2⁸¹⁶²²² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 816222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (907200).

816222 is an abundant number, since it is smaller than the sum of its proper divisors (998178).

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

816222 is a wasteful number, since it uses less digits than its factorization.

816222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248.

The product of its digits is 384, while the sum is 21.

The square root of 816222 is about 903.4500539598. The cubic root of 816222 is about 93.4550481204.

The spelling of 816222 in words is "eight hundred sixteen thousand, two hundred twenty-two".