9989806 has 4 divisors (see below), whose sum is σ = 14984712. Its totient is φ = 4994902.

The previous prime is 9989779. The next prime is 9989807. The reversal of 9989806 is 6089899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6089899 = 19 ⋅320521.

It is a self number, because there is not a number n which added to its sum of digits gives 9989806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9989807) by changing a digit.

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 as a sum of consecutive naturals, namely, 2497450 + ... + 2497453.

It is an arithmetic number, because the mean of its divisors is an integer number (3746178).

Almost surely, 2^9989806 is an apocalyptic number.

9989806 is a deficient number, since it is larger than the sum of its proper divisors (4994906).

9989806 is a wasteful number, since it uses less digits than its factorization.

9989806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4994905.

The product of its (nonzero) digits is 279936, while the sum is 49.

The square root of 9989806 is about 3160.6654362650. The cubic root of 9989806 is about 215.3702364224.

The spelling of 9989806 in words is "nine million, nine hundred eighty-nine thousand, eight hundred six".