871222 has 12 divisors (see below), whose sum is σ = 1432836. Its totient is φ = 394020.

The previous prime is 871181. The next prime is 871229. The reversal of 871222 is 222178.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 871193 and 871202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871229) by changing a digit.

871222 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 5 ways as a sum of consecutive naturals, for example, 4279 + ... + 4477.

It is an arithmetic number, because the mean of its divisors is an integer number (119403).

2⁸⁷¹²²² is an apocalyptic number.

871222 is a deficient number, since it is larger than the sum of its proper divisors (561614).

871222 is a wasteful number, since it uses less digits than its factorization.

871222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411 (or 212 counting only the distinct ones).

The product of its digits is 448, while the sum is 22.

The square root of 871222 is about 933.3927362049. The cubic root of 871222 is about 95.5087023675.

Multiplying 871222 by its sum of digits (22), we get a square (19166884 = 4378²).

871222 divided by its sum of digits (22) gives a square (39601 = 199²).

The spelling of 871222 in words is "eight hundred seventy-one thousand, two hundred twenty-two".