2001722 has 4 divisors (see below), whose sum is σ = 3002586. Its totient is φ = 1000860.

The previous prime is 2001721. The next prime is 2001731. The reversal of 2001722 is 2271002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1957201 + 44521 = 1399^2 + 211^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2001697 and 2001706.

It is not an unprimeable number, because it can be changed into a prime (2001721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500429 + ... + 500432.

2^2001722 is an apocalyptic number.

2001722 is a deficient number, since it is larger than the sum of its proper divisors (1000864).

2001722 is a wasteful number, since it uses less digits than its factorization.

2001722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000863.

The product of its (nonzero) digits is 56, while the sum is 14.

The square root of 2001722 is about 1414.8222503198. The cubic root of 2001722 is about 126.0282543507.

Adding to 2001722 its reverse (2271002), we get a palindrome (4272724).

The spelling of 2001722 in words is "two million, one thousand, seven hundred twenty-two".