990784 has 28 divisors (see below), whose sum is σ = 1997964. Its totient is φ = 487424.

The previous prime is 990767. The next prime is 990797. The reversal of 990784 is 487099.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 230400 + 760384 = 480^2 + 872^2 .

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, 7164 + ... + 7300.

2⁹⁹⁰⁷⁸⁴ 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 990784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (998982).

990784 is an abundant number, since it is smaller than the sum of its proper divisors (1007180).

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

990784 is a wasteful number, since it uses less digits than its factorization.

990784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 990784 is about 995.3813339620. The cubic root of 990784 is about 99.6918514199.

The spelling of 990784 in words is "nine hundred ninety thousand, seven hundred eighty-four".