1980784 has 40 divisors (see below), whose sum is σ = 4218480. Its totient is φ = 895488.

The previous prime is 1980773. The next prime is 1980791. The reversal of 1980784 is 4870891.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a zygodrome in base 7.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18459 + ... + 18565.

It is an arithmetic number, because the mean of its divisors is an integer number (105462).

2^1980784 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 1980784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2109240).

1980784 is an abundant number, since it is smaller than the sum of its proper divisors (2237696).

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

1980784 is a wasteful number, since it uses less digits than its factorization.

1980784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 1980784 is about 1407.4032826450. The cubic root of 1980784 is about 125.5872950217.

It can be divided in two parts, 19807 and 84, that added together give a palindrome (19891).

The spelling of 1980784 in words is "one million, nine hundred eighty thousand, seven hundred eighty-four".