9978806 has 16 divisors (see below), whose sum is σ = 15301440. Its totient is φ = 4879680.

The previous prime is 9978799. The next prime is 9978811. The reversal of 9978806 is 6088799.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 21416 + ... + 21876.

It is an arithmetic number, because the mean of its divisors is an integer number (956340).

Almost surely, 2^9978806 is an apocalyptic number.

9978806 is a deficient number, since it is larger than the sum of its proper divisors (5322634).

9978806 is a wasteful number, since it uses less digits than its factorization.

9978806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 9978806 is about 3158.9248170857. The cubic root of 9978806 is about 215.2911577202.

The spelling of 9978806 in words is "nine million, nine hundred seventy-eight thousand, eight hundred six".