6403643 has 2 divisors, whose sum is σ = 6403644. Its totient is φ = 6403642.

The previous prime is 6403601. The next prime is 6403651. The reversal of 6403643 is 3463046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6403643 - 2⁸ = 6403387 is a prime.

It is not a weakly prime, because it can be changed into another prime (6403343) 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, 3201821 + 3201822.

It is an arithmetic number, because the mean of its divisors is an integer number (3201822).

Almost surely, 2^6403643 is an apocalyptic number.

6403643 is a deficient number, since it is larger than the sum of its proper divisors (1).

6403643 is an equidigital number, since it uses as much as digits as its factorization.

6403643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 26.

The square root of 6403643 is about 2530.5420367977. The cubic root of 6403643 is about 185.6987743878.

Adding to 6403643 its reverse (3463046), we get a palindrome (9866689).

The spelling of 6403643 in words is "six million, four hundred three thousand, six hundred forty-three".