23640 is nontrivially palindromic in base 14.
23640 is a nontrivial repdigit in base 14.
It is a plaindrome in base 14.
It is a nialpdrome in base 14.
It is a zygodrome in base 14.
It is a congruent number.
It is an unprimeable number.
223640 is an apocalyptic number.
23640 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 23640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35640).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
23640 is a wasteful number, since it uses less digits than its factorization.
23640 is an odious number, because the sum of its binary digits is odd.
The square root of 23640 is about 153.7530487503. The cubic root of 23640 is about 28.7000392542.
The spelling of 23640 in words is "twenty-three thousand, six hundred forty".