806389643 has 2 divisors, whose sum is σ = 806389644. Its totient is φ = 806389642.

The previous prime is 806389607. The next prime is 806389657. The reversal of 806389643 is 346983608.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 806389643 - 2¹⁸ = 806127499 is a prime.

It is not a weakly prime, because it can be changed into another prime (806389603) 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 as a sum of consecutive naturals, namely, 403194821 + 403194822.

It is an arithmetic number, because the mean of its divisors is an integer number (403194822).

Almost surely, 2^806389643 is an apocalyptic number.

806389643 is a deficient number, since it is larger than the sum of its proper divisors (1).

806389643 is an equidigital number, since it uses as much as digits as its factorization.

806389643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 47.

The square root of 806389643 is about 28397.0005986548. Note that the first 3 decimals coincide. The cubic root of 806389643 is about 930.7827237095.

The spelling of 806389643 in words is "eight hundred six million, three hundred eighty-nine thousand, six hundred forty-three".