1984840 has 64 divisors (see below), whose sum is σ = 5261760. Its totient is φ = 664320.

The previous prime is 1984817. The next prime is 1984841. The reversal of 1984840 is 484891.

It is a junction number, because it is equal to n+sod(n) for n = 1984796 and 1984805.

It is not an unprimeable number, because it can be changed into a prime (1984841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5547 + ... + 5893.

It is an arithmetic number, because the mean of its divisors is an integer number (82215).

2^1984840 is an apocalyptic number.

1984840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1984840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2630880).

1984840 is an abundant number, since it is smaller than the sum of its proper divisors (3276920).

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

1984840 is a wasteful number, since it uses less digits than its factorization.

1984840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 1984840 is about 1408.8434973410. The cubic root of 1984840 is about 125.6729571940.

The spelling of 1984840 in words is "one million, nine hundred eighty-four thousand, eight hundred forty".