8939243809 has 2 divisors, whose sum is σ = 8939243810. Its totient is φ = 8939243808.

The previous prime is 8939243801. The next prime is 8939243827. The reversal of 8939243809 is 9083429398.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8635613184 + 303630625 = 92928^2 + 17425^2 .

It is a cyclic number.

It is not a de Polignac number, because 8939243809 - 2³ = 8939243801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8939243809.

It is not a weakly prime, because it can be changed into another prime (8939243801) 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, 4469621904 + 4469621905.

It is an arithmetic number, because the mean of its divisors is an integer number (4469621905).

Almost surely, 2^8939243809 is an apocalyptic number.

It is an amenable number.

8939243809 is a deficient number, since it is larger than the sum of its proper divisors (1).

8939243809 is an equidigital number, since it uses as much as digits as its factorization.

8939243809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 55.

The square root of 8939243809 is about 94547.5743157909. The cubic root of 8939243809 is about 2075.3925852439.

The spelling of 8939243809 in words is "eight billion, nine hundred thirty-nine million, two hundred forty-three thousand, eight hundred nine".