9998840 has 16 divisors (see below), whose sum is σ = 22497480. Its totient is φ = 3999520.

The previous prime is 9998809. The next prime is 9998851. The reversal of 9998840 is 488999.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124946 + ... + 125025.

Almost surely, 2^9998840 is an apocalyptic number.

It is an amenable number.

9998840 is an abundant number, since it is smaller than the sum of its proper divisors (12498640).

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

9998840 is a wasteful number, since it uses less digits than its factorization.

9998840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249982 (or 249978 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 9998840 is about 3162.0942427448. The cubic root of 9998840 is about 215.4351382003.

The spelling of 9998840 in words is "nine million, nine hundred ninety-eight thousand, eight hundred forty".