9783666 has 48 divisors (see below), whose sum is σ = 22565088. Its totient is φ = 3175200.

The previous prime is 9783659. The next prime is 9783667. The reversal of 9783666 is 6663879.

It is not an unprimeable number, because it can be changed into a prime (9783667) 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 23 ways as a sum of consecutive naturals, for example, 19681 + ... + 20171.

It is an arithmetic number, because the mean of its divisors is an integer number (470106).

Almost surely, 2^9783666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9783666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11282544).

9783666 is an abundant number, since it is smaller than the sum of its proper divisors (12781422).

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

9783666 is a wasteful number, since it uses less digits than its factorization.

9783666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549 (or 537 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 9783666 is about 3127.8852280734. The cubic root of 9783666 is about 213.8785376474.

The spelling of 9783666 in words is "nine million, seven hundred eighty-three thousand, six hundred sixty-six".