9997847 has 4 divisors (see below), whose sum is σ = 10432560. Its totient is φ = 9563136.

The previous prime is 9997831. The next prime is 9997859. The reversal of 9997847 is 7487999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7487999 = 53 ⋅141283.

It is a cyclic number.

It is not a de Polignac number, because 9997847 - 2⁴ = 9997831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217322 + ... + 217367.

It is an arithmetic number, because the mean of its divisors is an integer number (2608140).

Almost surely, 2^9997847 is an apocalyptic number.

9997847 is a deficient number, since it is larger than the sum of its proper divisors (434713).

9997847 is a wasteful number, since it uses less digits than its factorization.

9997847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434712.

The product of its digits is 1143072, while the sum is 53.

The square root of 9997847 is about 3161.9372226532. The cubic root of 9997847 is about 215.4280062338.

The spelling of 9997847 in words is "nine million, nine hundred ninety-seven thousand, eight hundred forty-seven".