9947780 has 12 divisors (see below), whose sum is σ = 20890380. Its totient is φ = 3979104.

The previous prime is 9947779. The next prime is 9947803. The reversal of 9947780 is 877499.

It can be written as a sum of positive squares in 2 ways, for example, as 3556996 + 6390784 = 1886^2 + 2528^2 .

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 3 ways as a sum of consecutive naturals, for example, 248675 + ... + 248714.

It is an arithmetic number, because the mean of its divisors is an integer number (1740865).

Almost surely, 2^9947780 is an apocalyptic number.

It is an amenable number.

9947780 is an abundant number, since it is smaller than the sum of its proper divisors (10942600).

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

9947780 is a wasteful number, since it uses less digits than its factorization.

9947780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497398 (or 497396 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 9947780 is about 3154.0101458302. The cubic root of 9947780 is about 215.0677990612.

The spelling of 9947780 in words is "nine million, nine hundred forty-seven thousand, seven hundred eighty".