6404789 has 2 divisors, whose sum is σ = 6404790. Its totient is φ = 6404788.

The previous prime is 6404779. The next prime is 6404791. The reversal of 6404789 is 9874046.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4169764 + 2235025 = 2042^2 + 1495^2 .

It is a cyclic number.

It is not a de Polignac number, because 6404789 - 2⁴ = 6404773 is a prime.

Together with 6404791, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6404719) 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, 3202394 + 3202395.

It is an arithmetic number, because the mean of its divisors is an integer number (3202395).

Almost surely, 2^6404789 is an apocalyptic number.

It is an amenable number.

6404789 is a deficient number, since it is larger than the sum of its proper divisors (1).

6404789 is an equidigital number, since it uses as much as digits as its factorization.

6404789 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 6404789 is about 2530.7684603693. The cubic root of 6404789 is about 185.7098513171.

The spelling of 6404789 in words is "six million, four hundred four thousand, seven hundred eighty-nine".