2001397 has 2 divisors, whose sum is σ = 2001398. Its totient is φ = 2001396.

The previous prime is 2001371. The next prime is 2001407. The reversal of 2001397 is 7931002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1779556 + 221841 = 1334^2 + 471^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001397 - 2⁷ = 2001269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000698 + 1000699.

It is an arithmetic number, because the mean of its divisors is an integer number (1000699).

2^2001397 is an apocalyptic number.

It is an amenable number.

2001397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001397 is an equidigital number, since it uses as much as digits as its factorization.

2001397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 2001397 is about 1414.7073902401. The cubic root of 2001397 is about 126.0214333237.

Adding to 2001397 its reverse (7931002), we get a palindrome (9932399).

The spelling of 2001397 in words is "two million, one thousand, three hundred ninety-seven".