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.
105840 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
2105840 is an apocalyptic number.
105840 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 105840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212040).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
105840 is a wasteful number, since it uses less digits than its factorization.
105840 is an odious number, because the sum of its binary digits is odd.
The square root of 105840 is about 325.3306010814. The cubic root of 105840 is about 47.3024109786.
The spelling of 105840 in words is "one hundred five thousand, eight hundred forty".