47840 divided by its sum of digits (23) gives a triangular number (2080 = T64).
47840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a congruent number.
It is equal to the Eulerian number A(10, 2).
247840 is an apocalyptic number.
47840 is a gapful number since it is divisible by the number (40) 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 47840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63504).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
47840 is a wasteful number, since it uses less digits than its factorization.
47840 is an evil number, because the sum of its binary digits is even.
The square root of 47840 is about 218.7235698319. The cubic root of 47840 is about 36.3019864486.
The spelling of 47840 in words is "forty-seven thousand, eight hundred forty".