1328784 has 80 divisors (see below), whose sum is σ = 3809280. Its totient is φ = 397440.

The previous prime is 1328783. The next prime is 1328797. The reversal of 1328784 is 4878231.

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (1328783) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 28249 + ... + 28295.

It is an arithmetic number, because the mean of its divisors is an integer number (47616).

2^1328784 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 1328784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1904640).

1328784 is an abundant number, since it is smaller than the sum of its proper divisors (2480496).

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

1328784 is a wasteful number, since it uses less digits than its factorization.

1328784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 102 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 1328784 is about 1152.7289360470. The cubic root of 1328784 is about 109.9389192574.

It can be divided in two parts, 1328 and 784, that added together give a palindrome (2112).

The spelling of 1328784 in words is "one million, three hundred twenty-eight thousand, seven hundred eighty-four".