9990847 has 2 divisors, whose sum is σ = 9990848. Its totient is φ = 9990846.

The previous prime is 9990833. The next prime is 9990857. The reversal of 9990847 is 7480999.

9990847 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9990847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9990797 and 9990806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9990817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995423 + 4995424.

It is an arithmetic number, because the mean of its divisors is an integer number (4995424).

Almost surely, 2^9990847 is an apocalyptic number.

9990847 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990847 is an equidigital number, since it uses as much as digits as its factorization.

9990847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 9990847 is about 3160.8301124863. The cubic root of 9990847 is about 215.3777171358.

The spelling of 9990847 in words is "nine million, nine hundred ninety thousand, eight hundred forty-seven".