9928139 has 8 divisors (see below), whose sum is σ = 10920000. Its totient is φ = 8968896.

The previous prime is 9928133. The next prime is 9928151. The reversal of 9928139 is 9318299.

9928139 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 9928139 - 2¹² = 9924043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9928096 and 9928105.

It is not an unprimeable number, because it can be changed into a prime (9928133) 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, 7514 + ... + 8735.

It is an arithmetic number, because the mean of its divisors is an integer number (1365000).

Almost surely, 2^9928139 is an apocalyptic number.

9928139 is a deficient number, since it is larger than the sum of its proper divisors (991861).

9928139 is a wasteful number, since it uses less digits than its factorization.

9928139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16309.

The product of its digits is 34992, while the sum is 41.

The square root of 9928139 is about 3150.8949522318. The cubic root of 9928139 is about 214.9261617726.

The spelling of 9928139 in words is "nine million, nine hundred twenty-eight thousand, one hundred thirty-nine".