9928427 has 4 divisors (see below), whose sum is σ = 10068336. Its totient is φ = 9788520.

The previous prime is 9928409. The next prime is 9928441. The reversal of 9928427 is 7248299.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9928427 - 2¹⁴ = 9912043 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9928487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69848 + ... + 69989.

It is an arithmetic number, because the mean of its divisors is an integer number (2517084).

Almost surely, 2^9928427 is an apocalyptic number.

9928427 is a deficient number, since it is larger than the sum of its proper divisors (139909).

9928427 is a wasteful number, since it uses less digits than its factorization.

9928427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139908.

The product of its digits is 72576, while the sum is 41.

The square root of 9928427 is about 3150.9406532018. The cubic root of 9928427 is about 214.9282399779.

The spelling of 9928427 in words is "nine million, nine hundred twenty-eight thousand, four hundred twenty-seven".