2640843 has 10 divisors (see below), whose sum is σ = 3945084. Its totient is φ = 1760508.

The previous prime is 2640823. The next prime is 2640853. The reversal of 2640843 is 3480462.

2640843 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2640843 - 2⁶ = 2640779 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2640823) 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 9 ways as a sum of consecutive naturals, for example, 16221 + ... + 16382.

2^2640843 is an apocalyptic number.

2640843 is a deficient number, since it is larger than the sum of its proper divisors (1304241).

2640843 is an equidigital number, since it uses as much as digits as its factorization.

2640843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32615 (or 32606 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 2640843 is about 1625.0670755387. The cubic root of 2640843 is about 138.2231738599.

The spelling of 2640843 in words is "two million, six hundred forty thousand, eight hundred forty-three".