984640 has 56 divisors (see below), whose sum is σ = 2496312. Its totient is φ = 368640.

The previous prime is 984617. The next prime is 984667. The reversal of 984640 is 46489.

It can be written as a sum of positive squares in 4 ways, for example, as 16384 + 968256 = 128^2 + 984^2 .

It is an Ulam number.

It is an unprimeable number.

984640 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5350 + ... + 5530.

It is an arithmetic number, because the mean of its divisors is an integer number (44577).

2⁹⁸⁴⁶⁴⁰ 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 984640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1248156).

984640 is an abundant number, since it is smaller than the sum of its proper divisors (1511672).

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

984640 is a wasteful number, since it uses less digits than its factorization.

984640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215 (or 205 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 984640 is about 992.2902801096. The cubic root of 984640 is about 99.4853559587.

The spelling of 984640 in words is "nine hundred eighty-four thousand, six hundred forty".