9728217 has 6 divisors (see below), whose sum is σ = 14051882. Its totient is φ = 6485472.

The previous prime is 9728197. The next prime is 9728231. The reversal of 9728217 is 7128279.

It can be written as a sum of positive squares in only one way, i.e., 8874441 + 853776 = 2979^2 + 924^2 .

It is not a de Polignac number, because 9728217 - 2⁶ = 9728153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9728317) 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 5 ways as a sum of consecutive naturals, for example, 540448 + ... + 540465.

Almost surely, 2^9728217 is an apocalyptic number.

It is an amenable number.

9728217 is a deficient number, since it is larger than the sum of its proper divisors (4323665).

9728217 is a wasteful number, since it uses less digits than its factorization.

9728217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080919 (or 1080916 counting only the distinct ones).

The product of its digits is 14112, while the sum is 36.

The square root of 9728217 is about 3119.0089772234. The cubic root of 9728217 is about 213.4737191753.

The spelling of 9728217 in words is "nine million, seven hundred twenty-eight thousand, two hundred seventeen".