9989780 has 24 divisors (see below), whose sum is σ = 21059808. Its totient is φ = 3980448.

The previous prime is 9989779. The next prime is 9989807. The reversal of 9989780 is 879899.

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, 5327 + ... + 6953.

It is an arithmetic number, because the mean of its divisors is an integer number (877492).

Almost surely, 2^9989780 is an apocalyptic number.

It is an amenable number.

9989780 is an abundant number, since it is smaller than the sum of its proper divisors (11070028).

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

9989780 is a wasteful number, since it uses less digits than its factorization.

9989780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1943 (or 1941 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 9989780 is about 3160.6613232044. The cubic root of 9989780 is about 215.3700495775.

The spelling of 9989780 in words is "nine million, nine hundred eighty-nine thousand, seven hundred eighty".