It is a tau number, because it is divible by the number of its divisors (40).
It is a nialpdrome in base 12.
It is an unprimeable number.
2225840 is an apocalyptic number.
225840 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 pseudoperfect number, because it is the sum of a subset of its proper divisors.
225840 is a wasteful number, since it uses less digits than its factorization.
225840 is an evil number, because the sum of its binary digits is even.
The square root of 225840 is about 475.2262619006. The cubic root of 225840 is about 60.8976155839.
The spelling of 225840 in words is "two hundred twenty-five thousand, eight hundred forty".