1722 is an esthetic number in base 9, because in such base its adjacent digits differ by 1.
It is a nude number because it is divisible by every one of its digits.
1722 is an undulating number in base 9.
It is a plaindrome in base 15.
It is a nialpdrome in base 12.
1722 is a Giuga number.
21722 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2016).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1722 is a wasteful number, since it uses less digits than its factorization.
1722 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 53.
The square root of 1722 is about 41.4969878425. The cubic root of 1722 is about 11.9860950049.
Adding to 1722 its reverse (2271), we get a palindrome (3993).
The spelling of 1722 in words is "one thousand, seven hundred twenty-two", and thus it is an iban number.