989666 has 8 divisors (see below), whose sum is σ = 1509840. Its totient is φ = 486388.

The previous prime is 989663. The next prime is 989671. The reversal of 989666 is 666989.

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 989666.

It is not an unprimeable number, because it can be changed into a prime (989663) 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 3 ways as a sum of consecutive naturals, for example, 4076 + ... + 4311.

It is an arithmetic number, because the mean of its divisors is an integer number (188730).

2⁹⁸⁹⁶⁶⁶ is an apocalyptic number.

989666 is a deficient number, since it is larger than the sum of its proper divisors (520174).

989666 is a wasteful number, since it uses less digits than its factorization.

989666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8448.

The product of its digits is 139968, while the sum is 44.

The square root of 989666 is about 994.8195816328. The cubic root of 989666 is about 99.6543399010.

The spelling of 989666 in words is "nine hundred eighty-nine thousand, six hundred sixty-six".