1722 has 16 divisors (see below), whose sum is σ = 4032. Its totient is φ = 480.

The previous prime is 1721. The next prime is 1723. The reversal of 1722 is 2271.

1722 is an esthetic number in base 9, because in such base its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (1721) and next prime (1723).

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.

It is a junction number, because it is equal to n+sod(n) for n = 1698 and 1707.

It is not an unprimeable number, because it can be changed into a prime (1721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22 + ... + 62.

It is an arithmetic number, because the mean of its divisors is an integer number (252).

1722 is a Giuga number.

2¹⁷²² is an apocalyptic number.

It is a pronic number, being equal to 41×42.

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).

1722 is an abundant number, since it is smaller than the sum of its proper divisors (2310).

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 product of its digits is 28, while the sum is 12.

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.