9947239 has 2 divisors, whose sum is σ = 9947240. Its totient is φ = 9947238.

The previous prime is 9947237. The next prime is 9947243. The reversal of 9947239 is 9327499.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9947239 - 2¹ = 9947237 is a prime.

Together with 9947237, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 9947195 and 9947204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9947237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4973619 + 4973620.

It is an arithmetic number, because the mean of its divisors is an integer number (4973620).

Almost surely, 2^9947239 is an apocalyptic number.

9947239 is a deficient number, since it is larger than the sum of its proper divisors (1).

9947239 is an equidigital number, since it uses as much as digits as its factorization.

9947239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 43.

The square root of 9947239 is about 3153.9243808310. The cubic root of 9947239 is about 215.0639002419.

The spelling of 9947239 in words is "nine million, nine hundred forty-seven thousand, two hundred thirty-nine".