9728399939 has 2 divisors, whose sum is σ = 9728399940. Its totient is φ = 9728399938.

The previous prime is 9728399929. The next prime is 9728400013. The reversal of 9728399939 is 9399938279.

9728399939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9728399939 - 2³² = 5433432643 is a prime.

It is not a weakly prime, because it can be changed into another prime (9728399909) 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, 4864199969 + 4864199970.

It is an arithmetic number, because the mean of its divisors is an integer number (4864199970).

Almost surely, 2^9728399939 is an apocalyptic number.

9728399939 is a deficient number, since it is larger than the sum of its proper divisors (1).

9728399939 is an equidigital number, since it uses as much as digits as its factorization.

9728399939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 59521392, while the sum is 68.

The square root of 9728399939 is about 98632.6514851953. The cubic root of 9728399939 is about 2134.7505729047.

The spelling of 9728399939 in words is "nine billion, seven hundred twenty-eight million, three hundred ninety-nine thousand, nine hundred thirty-nine".