9721040 has 40 divisors (see below), whose sum is σ = 25831680. Its totient is φ = 3332736.

The previous prime is 9721039. The next prime is 9721067. The reversal of 9721040 is 401279.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 9720997 and 9721015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8120 + ... + 9239.

It is an arithmetic number, because the mean of its divisors is an integer number (645792).

Almost surely, 2^9721040 is an apocalyptic number.

It is an amenable number.

9721040 is an abundant number, since it is smaller than the sum of its proper divisors (16110640).

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

9721040 is a wasteful number, since it uses less digits than its factorization.

9721040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17379 (or 17373 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 9721040 is about 3117.8582392405. The cubic root of 9721040 is about 213.4212094569.

The spelling of 9721040 in words is "nine million, seven hundred twenty-one thousand, forty".