2172224 has 14 divisors (see below), whose sum is σ = 4310634. Its totient is φ = 1086080.

The previous prime is 2172211. The next prime is 2172227. The reversal of 2172224 is 4222712.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1849600 + 322624 = 1360^2 + 568^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2172196 and 2172205.

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 as a sum of consecutive naturals, namely, 16907 + ... + 17034.

2^2172224 is an apocalyptic number.

It is an amenable number.

2172224 is a deficient number, since it is larger than the sum of its proper divisors (2138410).

2172224 is an equidigital number, since it uses as much as digits as its factorization.

2172224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33953 (or 33943 counting only the distinct ones).

The product of its digits is 448, while the sum is 20.

The square root of 2172224 is about 1473.8466677372. The cubic root of 2172224 is about 129.5094729285.

Adding to 2172224 its reverse (4222712), we get a palindrome (6394936).

The spelling of 2172224 in words is "two million, one hundred seventy-two thousand, two hundred twenty-four".