9898640 has 20 divisors (see below), whose sum is σ = 23014524. Its totient is φ = 3959424.

The previous prime is 9898633. The next prime is 9898649. The reversal of 9898640 is 468989.

It can be written as a sum of positive squares in 2 ways, for example, as 5914624 + 3984016 = 2432^2 + 1996^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 9898591 and 9898600.

It is not an unprimeable number, because it can be changed into a prime (9898649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61787 + ... + 61946.

Almost surely, 2^9898640 is an apocalyptic number.

It is an amenable number.

9898640 is an abundant number, since it is smaller than the sum of its proper divisors (13115884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9898640 is a wasteful number, since it uses less digits than its factorization.

9898640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123746 (or 123740 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 9898640 is about 3146.2104189008. The cubic root of 9898640 is about 214.7130840218.

The spelling of 9898640 in words is "nine million, eight hundred ninety-eight thousand, six hundred forty".