1720222 has 32 divisors (see below), whose sum is σ = 3225600. Its totient is φ = 671328.

The previous prime is 1720219. The next prime is 1720223. The reversal of 1720222 is 2220271.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1720196 and 1720205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7603 + ... + 7825.

It is an arithmetic number, because the mean of its divisors is an integer number (100800).

2^1720222 is an apocalyptic number.

1720222 is a deficient number, since it is larger than the sum of its proper divisors (1505378).

1720222 is a wasteful number, since it uses less digits than its factorization.

1720222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 1720222 is about 1311.5723388361. The cubic root of 1720222 is about 119.8196828872.

Adding to 1720222 its reverse (2220271), we get a palindrome (3940493).

The spelling of 1720222 in words is "one million, seven hundred twenty thousand, two hundred twenty-two".