It is a nialpdrome in base 8.
It is an unprimeable number.
223240 is an apocalyptic number.
23240 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 23240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30240).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
23240 is a wasteful number, since it uses less digits than its factorization.
23240 is an odious number, because the sum of its binary digits is odd.
The square root of 23240 is about 152.4467120013. The cubic root of 23240 is about 28.5372448321.
Adding to 23240 its reverse (4232), we get a palindrome (27472).
The spelling of 23240 in words is "twenty-three thousand, two hundred forty", and thus it is an iban number.