1321984 has 22 divisors (see below), whose sum is σ = 2644724. Its totient is φ = 660480.

The previous prime is 1321981. The next prime is 1321997. The reversal of 1321984 is 4891231.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1321981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 379 + ... + 1669.

2^1321984 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 1321984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1322362).

1321984 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1321984 is an equidigital number, since it uses as much as digits as its factorization.

1321984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311 (or 1293 counting only the distinct ones).

The product of its digits is 1728, while the sum is 28.

The square root of 1321984 is about 1149.7756302862. The cubic root of 1321984 is about 109.7510624064.

It can be divided in two parts, 132 and 1984, that added together give a square (2116 = 46²).

The spelling of 1321984 in words is "one million, three hundred twenty-one thousand, nine hundred eighty-four".