9721245 has 16 divisors (see below), whose sum is σ = 15886080. Its totient is φ = 5073984.

The previous prime is 9721241. The next prime is 9721247. The reversal of 9721245 is 5421279.

9721245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9721245 - 2² = 9721241 is a prime.

9721245 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9721241) 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, 6190 + ... + 7599.

It is an arithmetic number, because the mean of its divisors is an integer number (992880).

Almost surely, 2^9721245 is an apocalyptic number.

It is an amenable number.

9721245 is a deficient number, since it is larger than the sum of its proper divisors (6164835).

9721245 is a wasteful number, since it uses less digits than its factorization.

9721245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13844.

The product of its digits is 5040, while the sum is 30.

The square root of 9721245 is about 3117.8911141988. The cubic root of 9721245 is about 213.4227096750.

The spelling of 9721245 in words is "nine million, seven hundred twenty-one thousand, two hundred forty-five".