It is a Jordan-Polya number, since it can be written as 7! ⋅ (3!)2.
It is a tau number, because it is divible by the number of its divisors (140).
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 181440.
It is an unprimeable number.
2181440 is an apocalyptic number.
181440 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 181440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (368808).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
181440 is an equidigital number, since it uses as much as digits as its factorization.
181440 is an evil number, because the sum of its binary digits is even.
The square root of 181440 is about 425.9577443832. The cubic root of 181440 is about 56.6123277638.
The spelling of 181440 in words is "one hundred eighty-one thousand, four hundred forty".