990684 has 24 divisors (see below), whose sum is σ = 2568720. Its totient is φ = 330192.

The previous prime is 990673. The next prime is 990707. The reversal of 990684 is 486099.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4479 + ... + 4694.

It is an arithmetic number, because the mean of its divisors is an integer number (107030).

2⁹⁹⁰⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

990684 is an abundant number, since it is smaller than the sum of its proper divisors (1578036).

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

990684 is a wasteful number, since it uses less digits than its factorization.

990684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9186 (or 9178 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 990684 is about 995.3311006896. The cubic root of 990684 is about 99.6884973351.

The spelling of 990684 in words is "nine hundred ninety thousand, six hundred eighty-four".