9998540 has 12 divisors (see below), whose sum is σ = 20996976. Its totient is φ = 3999408.

The previous prime is 9998539. The next prime is 9998543. The reversal of 9998540 is 458999.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9998491 and 9998500.

It is not an unprimeable number, because it can be changed into a prime (9998543) 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, 249944 + ... + 249983.

It is an arithmetic number, because the mean of its divisors is an integer number (1749748).

Almost surely, 2^9998540 is an apocalyptic number.

It is an amenable number.

9998540 is an abundant number, since it is smaller than the sum of its proper divisors (10998436).

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

9998540 is a wasteful number, since it uses less digits than its factorization.

9998540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499936 (or 499934 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 9998540 is about 3162.0468054727. The cubic root of 9998540 is about 215.4329835774.

The spelling of 9998540 in words is "nine million, nine hundred ninety-eight thousand, five hundred forty".