It is a happy number.
It is a tau number, because it is divible by the number of its divisors (112).
It is a congruent number.
It is an unprimeable number.
21323840 is an apocalyptic number.
1323840 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 1323840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2414016).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1323840 is a wasteful number, since it uses less digits than its factorization.
1323840 is an odious number, because the sum of its binary digits is odd.
The square root of 1323840 is about 1150.5824611909. The cubic root of 1323840 is about 109.8024000723.
The spelling of 1323840 in words is "one million, three hundred twenty-three thousand, eight hundred forty".