2251440 is a `hidden beast` number, since 225 + 1 + 440 = 666.
It is a tau number, because it is divible by the number of its divisors (120).
It is a congruent number.
It is an unprimeable number.
22251440 is an apocalyptic number.
2251440 is a gapful number since it is divisible by the number (20) 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 2251440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3917160).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
2251440 is a wasteful number, since it uses less digits than its factorization.
2251440 is an odious number, because the sum of its binary digits is odd.
The square root of 2251440 is about 1500.4799232246. The cubic root of 2251440 is about 131.0650183238.
Adding to 2251440 its reverse (441522), we get a palindrome (2692962).
The spelling of 2251440 in words is "two million, two hundred fifty-one thousand, four hundred forty".