7800340909 has 2 divisors, whose sum is σ = 7800340910. Its totient is φ = 7800340908.

The previous prime is 7800340813. The next prime is 7800340943. The reversal of 7800340909 is 9090430087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7559780809 + 240560100 = 86947^2 + 15510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7800340909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7800340969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3900170454 + 3900170455.

It is an arithmetic number, because the mean of its divisors is an integer number (3900170455).

Almost surely, 2^7800340909 is an apocalyptic number.

It is an amenable number.

7800340909 is a deficient number, since it is larger than the sum of its proper divisors (1).

7800340909 is an equidigital number, since it uses as much as digits as its factorization.

7800340909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 7800340909 is about 88319.5386593476. The cubic root of 7800340909 is about 1983.2213749165.

The spelling of 7800340909 in words is "seven billion, eight hundred million, three hundred forty thousand, nine hundred nine".