9928739 has 2 divisors, whose sum is σ = 9928740. Its totient is φ = 9928738.

The previous prime is 9928727. The next prime is 9928741. The reversal of 9928739 is 9378299.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9928739 is a prime.

Together with 9928741, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 9928693 and 9928702.

It is not a weakly prime, because it can be changed into another prime (9922739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4964369 + 4964370.

It is an arithmetic number, because the mean of its divisors is an integer number (4964370).

Almost surely, 2^9928739 is an apocalyptic number.

9928739 is a deficient number, since it is larger than the sum of its proper divisors (1).

9928739 is an equidigital number, since it uses as much as digits as its factorization.

9928739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 47.

The square root of 9928739 is about 3150.9901618380. The cubic root of 9928739 is about 214.9304913218.

The spelling of 9928739 in words is "nine million, nine hundred twenty-eight thousand, seven hundred thirty-nine".