989659818 has 24 divisors (see below), whose sum is σ = 2450586528. Its totient is φ = 282759912.

The previous prime is 989659817. The next prime is 989659823. The reversal of 989659818 is 818956989.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (989659813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3927096 + ... + 3927347.

It is an arithmetic number, because the mean of its divisors is an integer number (102107772).

Almost surely, 2^989659818 is an apocalyptic number.

989659818 is an abundant number, since it is smaller than the sum of its proper divisors (1460926710).

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

989659818 is a wasteful number, since it uses less digits than its factorization.

989659818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7854458 (or 7854455 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 63.

The square root of 989659818 is about 31458.8591337957. The cubic root of 989659818 is about 996.5413240185.

The spelling of 989659818 in words is "nine hundred eighty-nine million, six hundred fifty-nine thousand, eight hundred eighteen".