6396440773 has 2 divisors, whose sum is σ = 6396440774. Its totient is φ = 6396440772.

The previous prime is 6396440759. The next prime is 6396440779. The reversal of 6396440773 is 3770446936.

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., 4730413284 + 1666027489 = 68778^2 + 40817^2 .

It is a cyclic number.

It is not a de Polignac number, because 6396440773 - 2⁹ = 6396440261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6396440779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3198220386 + 3198220387.

It is an arithmetic number, because the mean of its divisors is an integer number (3198220387).

Almost surely, 2^6396440773 is an apocalyptic number.

It is an amenable number.

6396440773 is a deficient number, since it is larger than the sum of its proper divisors (1).

6396440773 is an equidigital number, since it uses as much as digits as its factorization.

6396440773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2286144, while the sum is 49.

The square root of 6396440773 is about 79977.7517375926. The cubic root of 6396440773 is about 1856.2912932003.

The spelling of 6396440773 in words is "six billion, three hundred ninety-six million, four hundred forty thousand, seven hundred seventy-three".