9799866 has 20 divisors (see below), whose sum is σ = 21959322. Its totient is φ = 3266568.

The previous prime is 9799849. The next prime is 9799897. The reversal of 9799866 is 6689979.

It can be written as a sum of positive squares in only one way, i.e., 6395841 + 3404025 = 2529^2 + 1845^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

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 9 ways as a sum of consecutive naturals, for example, 30085 + ... + 30408.

Almost surely, 2^9799866 is an apocalyptic number.

9799866 is an abundant number, since it is smaller than the sum of its proper divisors (12159456).

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

9799866 is a wasteful number, since it uses less digits than its factorization.

9799866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60507 (or 60498 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 54.

The square root of 9799866 is about 3130.4737660616. The cubic root of 9799866 is about 213.9965207458.

The spelling of 9799866 in words is "nine million, seven hundred ninety-nine thousand, eight hundred sixty-six".