6435643 has 2 divisors, whose sum is σ = 6435644. Its totient is φ = 6435642.

The previous prime is 6435629. The next prime is 6435691. The reversal of 6435643 is 3465346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6435643 - 2²¹ = 4338491 is a prime.

It is a d-powerful number, because it can be written as 6⁵ + 4² + 3⁵ + 5⁹ + 6⁷ + 4¹¹ + 3⁵ .

It is not a weakly prime, because it can be changed into another prime (6435613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3217821 + 3217822.

It is an arithmetic number, because the mean of its divisors is an integer number (3217822).

Almost surely, 2^6435643 is an apocalyptic number.

6435643 is a deficient number, since it is larger than the sum of its proper divisors (1).

6435643 is an equidigital number, since it uses as much as digits as its factorization.

6435643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 31.

The square root of 6435643 is about 2536.8569135842. The cubic root of 6435643 is about 186.0075824558.

The spelling of 6435643 in words is "six million, four hundred thirty-five thousand, six hundred forty-three".