2001797 has 6 divisors (see below), whose sum is σ = 2328678. Its totient is φ = 1715784.

The previous prime is 2001793. The next prime is 2001799. The reversal of 2001797 is 7971002.

It can be written as a sum of positive squares in only one way, i.e., 1999396 + 2401 = 1414^2 + 49^2 .

It is not a de Polignac number, because 2001797 - 2² = 2001793 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20378 + ... + 20475.

It is an arithmetic number, because the mean of its divisors is an integer number (388113).

2^2001797 is an apocalyptic number.

It is an amenable number.

2001797 is a deficient number, since it is larger than the sum of its proper divisors (326881).

2001797 is an equidigital number, since it uses as much as digits as its factorization.

2001797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40867 (or 40860 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 2001797 is about 1414.8487551678. The cubic root of 2001797 is about 126.0298283290.

Adding to 2001797 its reverse (7971002), we get a palindrome (9972799).

The spelling of 2001797 in words is "two million, one thousand, seven hundred ninety-seven".