9998538 has 32 divisors (see below), whose sum is σ = 21954240. Its totient is φ = 3010560.

The previous prime is 9998479. The next prime is 9998539. The reversal of 9998538 is 8358999.

It is not an unprimeable number, because it can be changed into a prime (9998539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12618 + ... + 13386.

It is an arithmetic number, because the mean of its divisors is an integer number (686070).

Almost surely, 2^9998538 is an apocalyptic number.

9998538 is an abundant number, since it is smaller than the sum of its proper divisors (11955702).

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

9998538 is a wasteful number, since it uses less digits than its factorization.

9998538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982.

The product of its digits is 699840, while the sum is 51.

The square root of 9998538 is about 3162.0464892218. The cubic root of 9998538 is about 215.4329692131.

The spelling of 9998538 in words is "nine million, nine hundred ninety-eight thousand, five hundred thirty-eight".