It is a congruent number.
223540 is an apocalyptic number.
23540 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 23540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27216).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
23540 is a wasteful number, since it uses less digits than its factorization.
23540 is an evil number, because the sum of its binary digits is even.
The square root of 23540 is about 153.4275073121. The cubic root of 23540 is about 28.6595138695.
The spelling of 23540 in words is "twenty-three thousand, five hundred forty".