6403321 has 2 divisors, whose sum is σ = 6403322. Its totient is φ = 6403320.

The previous prime is 6403303. The next prime is 6403333. The reversal of 6403321 is 1233046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5934096 + 469225 = 2436^2 + 685^2 .

It is a cyclic number.

It is not a de Polignac number, because 6403321 - 2⁷ = 6403193 is a prime.

It is not a weakly prime, because it can be changed into another prime (6403351) 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, 3201660 + 3201661.

It is an arithmetic number, because the mean of its divisors is an integer number (3201661).

Almost surely, 2^6403321 is an apocalyptic number.

It is an amenable number.

6403321 is a deficient number, since it is larger than the sum of its proper divisors (1).

6403321 is an equidigital number, since it uses as much as digits as its factorization.

6403321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 6403321 is about 2530.4784132650. The cubic root of 6403321 is about 185.6956617841.

Adding to 6403321 its reverse (1233046), we get a palindrome (7636367).

It can be divided in two parts, 6403 and 321, that added together give a square (6724 = 82²).

The spelling of 6403321 in words is "six million, four hundred three thousand, three hundred twenty-one".