9989666 has 8 divisors (see below), whose sum is σ = 14999040. Its totient is φ = 4989988.

The previous prime is 9989587. The next prime is 9989671. The reversal of 9989666 is 6669899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1295 + ... + 4653.

It is an arithmetic number, because the mean of its divisors is an integer number (1874880).

Almost surely, 2^9989666 is an apocalyptic number.

9989666 is a deficient number, since it is larger than the sum of its proper divisors (5009374).

9989666 is a wasteful number, since it uses less digits than its factorization.

9989666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4848.

The product of its digits is 1259712, while the sum is 53.

The square root of 9989666 is about 3160.6432889524. The cubic root of 9989666 is about 215.3692303309.

The spelling of 9989666 in words is "nine million, nine hundred eighty-nine thousand, six hundred sixty-six".