9971780 has 48 divisors (see below), whose sum is σ = 25777920. Its totient is φ = 3155328.

The previous prime is 9971779. The next prime is 9971783. The reversal of 9971780 is 871799.

It is not an unprimeable number, because it can be changed into a prime (9971783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 920 + ... + 4559.

It is an arithmetic number, because the mean of its divisors is an integer number (537040).

Almost surely, 2^9971780 is an apocalyptic number.

It is an amenable number.

9971780 is an abundant number, since it is smaller than the sum of its proper divisors (15806140).

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

9971780 is a wasteful number, since it uses less digits than its factorization.

9971780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5508 (or 5506 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 9971780 is about 3157.8125340178. The cubic root of 9971780 is about 215.2406175779.

The spelling of 9971780 in words is "nine million, nine hundred seventy-one thousand, seven hundred eighty".