989784 has 48 divisors (see below), whose sum is σ = 2737800. Its totient is φ = 322944.

The previous prime is 989783. The next prime is 989797. The reversal of 989784 is 487989.

989784 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

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 989784.

It is not an unprimeable number, because it can be changed into a prime (989783) 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, 4132 + ... + 4364.

2⁹⁸⁹⁷⁸⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1368900).

989784 is an abundant number, since it is smaller than the sum of its proper divisors (1748016).

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

989784 is a wasteful number, since it uses less digits than its factorization.

989784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 297 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 989784 is about 994.8788871013. The cubic root of 989784 is about 99.6583004105.

The spelling of 989784 in words is "nine hundred eighty-nine thousand, seven hundred eighty-four".