9808398391 has 12 divisors (see below), whose sum is σ = 10724550984. Its totient is φ = 8896371600.

The previous prime is 9808398317. The next prime is 9808398401. The reversal of 9808398391 is 1938938089.

9808398391 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9808398391 - 2¹⁹ = 9807874103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9808398311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2737221 + ... + 2740801.

It is an arithmetic number, because the mean of its divisors is an integer number (893712582).

Almost surely, 2^9808398391 is an apocalyptic number.

9808398391 is a deficient number, since it is larger than the sum of its proper divisors (916152593).

9808398391 is an equidigital number, since it uses as much as digits as its factorization.

9808398391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4590 (or 4091 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 58.

The square root of 9808398391 is about 99037.3585623122. The cubic root of 9808398391 is about 2140.5860908895.

The spelling of 9808398391 in words is "nine billion, eight hundred eight million, three hundred ninety-eight thousand, three hundred ninety-one".