9781120 has 128 divisors (see below), whose sum is σ = 26438400. Its totient is φ = 3440640.

The previous prime is 9781117. The next prime is 9781127. The reversal of 9781120 is 211879.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9781127) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 315505 + ... + 315535.

It is an arithmetic number, because the mean of its divisors is an integer number (206550).

Almost surely, 2^9781120 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 9781120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13219200).

9781120 is an abundant number, since it is smaller than the sum of its proper divisors (16657280).

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

9781120 is a wasteful number, since it uses less digits than its factorization.

9781120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 9781120 is about 3127.4782173502. The cubic root of 9781120 is about 213.8599835254.

Adding to 9781120 its reverse (211879), we get a palindrome (9992999).

The spelling of 9781120 in words is "nine million, seven hundred eighty-one thousand, one hundred twenty".