9808398865 has 4 divisors (see below), whose sum is σ = 11770078644. Its totient is φ = 7846719088.

The previous prime is 9808398851. The next prime is 9808398913. The reversal of 9808398865 is 5688938089.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7654325121 + 2154073744 = 87489^2 + 46412^2 .

It is a cyclic number.

It is not a de Polignac number, because 9808398865 - 2⁵ = 9808398833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9808398797 and 9808398806.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 980839882 + ... + 980839891.

It is an arithmetic number, because the mean of its divisors is an integer number (2942519661).

Almost surely, 2^9808398865 is an apocalyptic number.

It is an amenable number.

9808398865 is a deficient number, since it is larger than the sum of its proper divisors (1961679779).

9808398865 is a wasteful number, since it uses less digits than its factorization.

9808398865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961679778.

The product of its (nonzero) digits is 29859840, while the sum is 64.

The square root of 9808398865 is about 99037.3609553486. The cubic root of 9808398865 is about 2140.5861253714.

The spelling of 9808398865 in words is "nine billion, eight hundred eight million, three hundred ninety-eight thousand, eight hundred sixty-five".