9728109 has 6 divisors (see below), whose sum is σ = 14051726. Its totient is φ = 6485400.

The previous prime is 9728071. The next prime is 9728123. The reversal of 9728109 is 9018279.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9455625 + 272484 = 3075^2 + 522^2 .

It is not a de Polignac number, because 9728109 - 2¹³ = 9719917 is a prime.

It is a super-2 number, since 2×9728109² = 189272209431762, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9728129) 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, 540442 + ... + 540459.

Almost surely, 2^9728109 is an apocalyptic number.

It is an amenable number.

9728109 is a deficient number, since it is larger than the sum of its proper divisors (4323617).

9728109 is a wasteful number, since it uses less digits than its factorization.

9728109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080907 (or 1080904 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 9728109 is about 3118.9916639837. The cubic root of 9728109 is about 213.4729291968.

The spelling of 9728109 in words is "nine million, seven hundred twenty-eight thousand, one hundred nine".