9928409 has 2 divisors, whose sum is σ = 9928410. Its totient is φ = 9928408.

The previous prime is 9928403. The next prime is 9928441. The reversal of 9928409 is 9048299.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7038409 + 2890000 = 2653^2 + 1700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9928409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9928403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4964204 + 4964205.

It is an arithmetic number, because the mean of its divisors is an integer number (4964205).

Almost surely, 2^9928409 is an apocalyptic number.

It is an amenable number.

9928409 is a deficient number, since it is larger than the sum of its proper divisors (1).

9928409 is an equidigital number, since it uses as much as digits as its factorization.

9928409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 9928409 is about 3150.9377969106. The cubic root of 9928409 is about 214.9281100913.

The spelling of 9928409 in words is "nine million, nine hundred twenty-eight thousand, four hundred nine".