It is a tau number, because it is divible by the number of its divisors (48).
It is a self number, because there is not a number n which added to its sum of digits gives 183840.
It is an unprimeable number.
183840 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
2183840 is an apocalyptic number.
183840 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 183840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290304).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
183840 is a wasteful number, since it uses less digits than its factorization.
183840 is an odious number, because the sum of its binary digits is odd.
The square root of 183840 is about 428.7656702676. The cubic root of 183840 is about 56.8608486307.
Adding to 183840 its reverse (48381), we get a triangular number (232221 = T681).
The spelling of 183840 in words is "one hundred eighty-three thousand, eight hundred forty".