989966 has 8 divisors (see below), whose sum is σ = 1549584. Its totient is φ = 473440.

The previous prime is 989959. The next prime is 989971. The reversal of 989966 is 669989.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 989966.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 989966.

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, 10715 + ... + 10806.

It is an arithmetic number, because the mean of its divisors is an integer number (193698).

2⁹⁸⁹⁹⁶⁶ is an apocalyptic number.

989966 is a deficient number, since it is larger than the sum of its proper divisors (559618).

989966 is a wasteful number, since it uses less digits than its factorization.

989966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21546.

The product of its digits is 209952, while the sum is 47.

The square root of 989966 is about 994.9703513171. The cubic root of 989966 is about 99.6644083758.

The spelling of 989966 in words is "nine hundred eighty-nine thousand, nine hundred sixty-six".