2172222 has 24 divisors (see below), whose sum is σ = 5069064. Its totient is φ = 668304.

The previous prime is 2172211. The next prime is 2172227. The reversal of 2172222 is 2222712.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2172195 and 2172204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4408 + ... + 4875.

It is an arithmetic number, because the mean of its divisors is an integer number (211211).

2^2172222 is an apocalyptic number.

2172222 is an abundant number, since it is smaller than the sum of its proper divisors (2896842).

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

2172222 is a wasteful number, since it uses less digits than its factorization.

2172222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9304 (or 9301 counting only the distinct ones).

The product of its digits is 224, while the sum is 18.

The square root of 2172222 is about 1473.8459892404. The cubic root of 2172222 is about 129.5094331813.

Adding to 2172222 its reverse (2222712), we get a palindrome (4394934).

The spelling of 2172222 in words is "two million, one hundred seventy-two thousand, two hundred twenty-two".