9989778 has 32 divisors (see below), whose sum is σ = 21734784. Its totient is φ = 3048192.

The previous prime is 9989747. The next prime is 9989779. The reversal of 9989778 is 8779899.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (9989779) 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 15 ways as a sum of consecutive naturals, for example, 2451 + ... + 5097.

It is an arithmetic number, because the mean of its divisors is an integer number (679212).

Almost surely, 2^9989778 is an apocalyptic number.

9989778 is an abundant number, since it is smaller than the sum of its proper divisors (11745006).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9989778 is a wasteful number, since it uses less digits than its factorization.

9989778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2706.

The product of its digits is 2286144, while the sum is 57.

The square root of 9989778 is about 3160.6610068149. The cubic root of 9989778 is about 215.3700352048.

The spelling of 9989778 in words is "nine million, nine hundred eighty-nine thousand, seven hundred seventy-eight".