2809643 has 2 divisors, whose sum is σ = 2809644. Its totient is φ = 2809642.

The previous prime is 2809637. The next prime is 2809649. The reversal of 2809643 is 3469082.

It is a balanced prime because it is at equal distance from previous prime (2809637) and next prime (2809649).

It is a cyclic number.

It is not a de Polignac number, because 2809643 - 2⁴ = 2809627 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2809649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1404821 + 1404822.

It is an arithmetic number, because the mean of its divisors is an integer number (1404822).

2^2809643 is an apocalyptic number.

2809643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2809643 is an equidigital number, since it uses as much as digits as its factorization.

2809643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 2809643 is about 1676.1989738692. The cubic root of 2809643 is about 141.1075918733.

The spelling of 2809643 in words is "two million, eight hundred nine thousand, six hundred forty-three".