2001943 has 4 divisors (see below), whose sum is σ = 2089008. Its totient is φ = 1914880.

The previous prime is 2001919. The next prime is 2001953. The reversal of 2001943 is 3491002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3491002 = 2 ⋅1745501.

It is a cyclic number.

It is not a de Polignac number, because 2001943 - 2⁵ = 2001911 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2001943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001953) 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, 43498 + ... + 43543.

It is an arithmetic number, because the mean of its divisors is an integer number (522252).

2^2001943 is an apocalyptic number.

2001943 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2001943 is a deficient number, since it is larger than the sum of its proper divisors (87065).

2001943 is an equidigital number, since it uses as much as digits as its factorization.

2001943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87064.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 2001943 is about 1414.9003498480. The cubic root of 2001943 is about 126.0328922274.

Adding to 2001943 its reverse (3491002), we get a palindrome (5492945).

The spelling of 2001943 in words is "two million, one thousand, nine hundred forty-three".