9781980 has 48 divisors (see below), whose sum is σ = 29498784. Its totient is φ = 2407680.

The previous prime is 9781963. The next prime is 9781991. The reversal of 9781980 is 891879.

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 15 ways as a sum of consecutive naturals, for example, 5491 + ... + 7050.

It is an arithmetic number, because the mean of its divisors is an integer number (614558).

Almost surely, 2^9781980 is an apocalyptic number.

It is an amenable number.

9781980 is an abundant number, since it is smaller than the sum of its proper divisors (19716804).

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

9781980 is a wasteful number, since it uses less digits than its factorization.

9781980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12566 (or 12564 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 9781980 is about 3127.6157052937. The cubic root of 9781980 is about 213.8662511851.

The spelling of 9781980 in words is "nine million, seven hundred eighty-one thousand, nine hundred eighty".