2003997 has 4 divisors (see below), whose sum is σ = 2672000. Its totient is φ = 1335996.

The previous prime is 2003971. The next prime is 2003999. The reversal of 2003997 is 7993002.

2003997 is nontrivially palindromic in base 9.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2003997 - 2⁸ = 2003741 is a prime.

It is a D-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 (2003999) 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 3 ways as a sum of consecutive naturals, for example, 333997 + ... + 334002.

It is an arithmetic number, because the mean of its divisors is an integer number (668000).

2^2003997 is an apocalyptic number.

It is an amenable number.

2003997 is a deficient number, since it is larger than the sum of its proper divisors (668003).

2003997 is an equidigital number, since it uses as much as digits as its factorization.

2003997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668002.

The product of its (nonzero) digits is 3402, while the sum is 30.

The square root of 2003997 is about 1415.6260099334. The cubic root of 2003997 is about 126.0759808796.

Adding to 2003997 its reverse (7993002), we get a palindrome (9996999).

It can be divided in two parts, 2003 and 997, that multiplied together give a palindrome (1996991).

The spelling of 2003997 in words is "two million, three thousand, nine hundred ninety-seven".