It is a tau number, because it is divible by the number of its divisors (80).
It is an unprimeable number.
21812240 is an apocalyptic number.
1812240 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 1812240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3124800).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1812240 is a wasteful number, since it uses less digits than its factorization.
1812240 is an evil number, because the sum of its binary digits is even.
The square root of 1812240 is about 1346.1946367446. The cubic root of 1812240 is about 121.9191437723.
The spelling of 1812240 in words is "one million, eight hundred twelve thousand, two hundred forty".