9947845 has 12 divisors (see below), whose sum is σ = 12482316. Its totient is φ = 7610240.

The previous prime is 9947837. The next prime is 9947851. The reversal of 9947845 is 5487499.

9947845 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 4004001 + 5943844 = 2001^2 + 2438^2 .

It is not a de Polignac number, because 9947845 - 2³ = 9947837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9947795 and 9947804.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 765 + ... + 4525.

It is an arithmetic number, because the mean of its divisors is an integer number (1040193).

Almost surely, 2^9947845 is an apocalyptic number.

It is an amenable number.

9947845 is a deficient number, since it is larger than the sum of its proper divisors (2534471).

9947845 is a wasteful number, since it uses less digits than its factorization.

9947845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3812 (or 3789 counting only the distinct ones).

The product of its digits is 362880, while the sum is 46.

The square root of 9947845 is about 3154.0204501556. The cubic root of 9947845 is about 215.0682674865.

The spelling of 9947845 in words is "nine million, nine hundred forty-seven thousand, eight hundred forty-five".