It is a happy number.
It is a tau number, because it is divible by the number of its divisors (40).
25840 is an undulating number in base 13.
It is a congruent number.
25840 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
225840 is an apocalyptic number.
25840 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 25840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33480).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
25840 is a wasteful number, since it uses less digits than its factorization.
25840 is an odious number, because the sum of its binary digits is odd.
The square root of 25840 is about 160.7482503793. The cubic root of 25840 is about 29.5640664514.
The spelling of 25840 in words is "twenty-five thousand, eight hundred forty".