Adding to 1281040 its reverse (401821), we get a palindrome (1682861).
It is a happy number.
It is a tau number, because it is divible by the number of its divisors (40).
It is an Ulam number.
It is a congruent number.
21281040 is an apocalyptic number.
1281040 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 1281040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1517760).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1281040 is a wasteful number, since it uses less digits than its factorization.
1281040 is an odious number, because the sum of its binary digits is odd.
The square root of 1281040 is about 1131.8303759840. The cubic root of 1281040 is about 108.6061028941.
The spelling of 1281040 in words is "one million, two hundred eighty-one thousand, forty".