9991876 has 12 divisors (see below), whose sum is σ = 17612560. Its totient is φ = 4959720.

The previous prime is 9991847. The next prime is 9991879. The reversal of 9991876 is 6781999.

It is not an unprimeable number, because it can be changed into a prime (9991879) 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, 8430 + ... + 9541.

Almost surely, 2^9991876 is an apocalyptic number.

It is an amenable number.

9991876 is a deficient number, since it is larger than the sum of its proper divisors (7620684).

9991876 is a wasteful number, since it uses less digits than its factorization.

9991876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18114 (or 18112 counting only the distinct ones).

The product of its digits is 244944, while the sum is 49.

The square root of 9991876 is about 3160.9928819914. The cubic root of 9991876 is about 215.3851111056.

The spelling of 9991876 in words is "nine million, nine hundred ninety-one thousand, eight hundred seventy-six".