9978886 has 4 divisors (see below), whose sum is σ = 14968332. Its totient is φ = 4989442.

The previous prime is 9978883. The next prime is 9978887. The reversal of 9978886 is 6888799.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6888799 = 23 ⋅299513.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9978883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2494720 + ... + 2494723.

It is an arithmetic number, because the mean of its divisors is an integer number (3742083).

Almost surely, 2^9978886 is an apocalyptic number.

9978886 is a deficient number, since it is larger than the sum of its proper divisors (4989446).

9978886 is a wasteful number, since it uses less digits than its factorization.

9978886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4989445.

The product of its digits is 1741824, while the sum is 55.

The square root of 9978886 is about 3158.9374795966. The cubic root of 9978886 is about 215.2917330478.

The spelling of 9978886 in words is "nine million, nine hundred seventy-eight thousand, eight hundred eighty-six".