2643943 has 2 divisors, whose sum is σ = 2643944. Its totient is φ = 2643942.

The previous prime is 2643917. The next prime is 2643947. The reversal of 2643943 is 3493462.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2643943 is a prime.

It is a d-powerful number, because it can be written as 2 + 6 + 4⁵ + 3 + 9 + 4¹⁰ + 3¹³ .

2643943 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2643947) 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, 1321971 + 1321972.

It is an arithmetic number, because the mean of its divisors is an integer number (1321972).

2^2643943 is an apocalyptic number.

2643943 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643943 is an equidigital number, since it uses as much as digits as its factorization.

2643943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 31.

The square root of 2643943 is about 1626.0206025755. The cubic root of 2643943 is about 138.2772379452.

The spelling of 2643943 in words is "two million, six hundred forty-three thousand, nine hundred forty-three".