6404401 has 2 divisors, whose sum is σ = 6404402. Its totient is φ = 6404400.

The previous prime is 6404381. The next prime is 6404407. The reversal of 6404401 is 1044046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4906225 + 1498176 = 2215^2 + 1224^2 .

It is a cyclic number.

It is not a de Polignac number, because 6404401 - 2⁵ = 6404369 is a prime.

It is a Chen prime.

6404401 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6404407) 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, 3202200 + 3202201.

It is an arithmetic number, because the mean of its divisors is an integer number (3202201).

Almost surely, 2^6404401 is an apocalyptic number.

It is an amenable number.

6404401 is a deficient number, since it is larger than the sum of its proper divisors (1).

6404401 is an equidigital number, since it uses as much as digits as its factorization.

6404401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 6404401 is about 2530.6918026500. The cubic root of 6404401 is about 185.7061011609.

Adding to 6404401 its reverse (1044046), we get a palindrome (7448447).

It can be divided in two parts, 640 and 4401, that added together give a square (5041 = 71²).

The spelling of 6404401 in words is "six million, four hundred four thousand, four hundred one".