6400403 has 2 divisors, whose sum is σ = 6400404. Its totient is φ = 6400402.

The previous prime is 6400391. The next prime is 6400411. The reversal of 6400403 is 3040046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6400403 - 2¹² = 6396307 is a prime.

It is not a weakly prime, because it can be changed into another prime (6400423) 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, 3200201 + 3200202.

It is an arithmetic number, because the mean of its divisors is an integer number (3200202).

Almost surely, 2^6400403 is an apocalyptic number.

6400403 is a deficient number, since it is larger than the sum of its proper divisors (1).

6400403 is an equidigital number, since it uses as much as digits as its factorization.

6400403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 6400403 is about 2529.9017767494. The cubic root of 6400403 is about 185.6674502633.

Adding to 6400403 its reverse (3040046), we get a palindrome (9440449).

The spelling of 6400403 in words is "six million, four hundred thousand, four hundred three".