9938775799 has 2 divisors, whose sum is σ = 9938775800. Its totient is φ = 9938775798.

The previous prime is 9938775787. The next prime is 9938775823. The reversal of 9938775799 is 9975778399.

It is a weak prime.

It is an emirp because it is prime and its reverse (9975778399) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9938775799 - 2¹¹ = 9938773751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9938775299) 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, 4969387899 + 4969387900.

It is an arithmetic number, because the mean of its divisors is an integer number (4969387900).

Almost surely, 2^9938775799 is an apocalyptic number.

9938775799 is a deficient number, since it is larger than the sum of its proper divisors (1).

9938775799 is an equidigital number, since it uses as much as digits as its factorization.

9938775799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270050760, while the sum is 73.

The square root of 9938775799 is about 99693.4090048083. The cubic root of 9938775799 is about 2150.0289016486.

The spelling of 9938775799 in words is "nine billion, nine hundred thirty-eight million, seven hundred seventy-five thousand, seven hundred ninety-nine".