9720217 has 8 divisors (see below), whose sum is σ = 10511424. Its totient is φ = 8935248.

The previous prime is 9720203. The next prime is 9720223. The reversal of 9720217 is 7120279.

It is a happy number.

9720217 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9720217 - 2⁷ = 9720089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9720247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1998 + ... + 4840.

It is an arithmetic number, because the mean of its divisors is an integer number (1313928).

Almost surely, 2^9720217 is an apocalyptic number.

It is an amenable number.

9720217 is a deficient number, since it is larger than the sum of its proper divisors (791207).

9720217 is a wasteful number, since it uses less digits than its factorization.

9720217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3119.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 9720217 is about 3117.7262548210. The cubic root of 9720217 is about 213.4151864178.

The spelling of 9720217 in words is "nine million, seven hundred twenty thousand, two hundred seventeen".