9981040 has 80 divisors (see below), whose sum is σ = 25310880. Its totient is φ = 3645440.

The previous prime is 9981001. The next prime is 9981043. The reversal of 9981040 is 401899.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 9980993 and 9981011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9981043) 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, 55671 + ... + 55849.

It is an arithmetic number, because the mean of its divisors is an integer number (316386).

Almost surely, 2^9981040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9981040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12655440).

9981040 is an abundant number, since it is smaller than the sum of its proper divisors (15329840).

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

9981040 is a wasteful number, since it uses less digits than its factorization.

9981040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 9981040 is about 3159.2783986221. The cubic root of 9981040 is about 215.3072225867.

The spelling of 9981040 in words is "nine million, nine hundred eighty-one thousand, forty".