989689686 has 8 divisors (see below), whose sum is σ = 1979379384. Its totient is φ = 329896560.

The previous prime is 989689667. The next prime is 989689703. The reversal of 989689686 is 686986989.

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

989689686 is an admirable number.

989689686 is a strobogrammatic number because it is the same when read upside-down.

It is a self number, because there is not a number n which added to its sum of digits gives 989689686.

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, 82474135 + ... + 82474146.

It is an arithmetic number, because the mean of its divisors is an integer number (247422423).

Almost surely, 2^989689686 is an apocalyptic number.

989689686 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

989689686 is a wasteful number, since it uses less digits than its factorization.

989689686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164948286.

The product of its digits is 80621568, while the sum is 69.

The square root of 989689686 is about 31459.3338454583. Note that the first 3 decimals coincide. The cubic root of 989689686 is about 996.5513491458.

The spelling of 989689686 in words is "nine hundred eighty-nine million, six hundred eighty-nine thousand, six hundred eighty-six".