9721560 has 32 divisors (see below), whose sum is σ = 29165040. Its totient is φ = 2592384.

The previous prime is 9721529. The next prime is 9721561. The reversal of 9721560 is 651279.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9721561) 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 7 ways as a sum of consecutive naturals, for example, 40387 + ... + 40626.

Almost surely, 2^9721560 is an apocalyptic number.

It is an amenable number.

9721560 is an abundant number, since it is smaller than the sum of its proper divisors (19443480).

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

9721560 is a wasteful number, since it uses less digits than its factorization.

9721560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81027 (or 81023 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 9721560 is about 3117.9416287031. The cubic root of 9721560 is about 213.4250148470.

The spelling of 9721560 in words is "nine million, seven hundred twenty-one thousand, five hundred sixty".