It is a tau number, because it is divible by the number of its divisors (64).
It is a congruent number.
2138880 is an apocalyptic number.
138880 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 138880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195840).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
138880 is an equidigital number, since it uses as much as digits as its factorization.
138880 is an evil number, because the sum of its binary digits is even.
The square root of 138880 is about 372.6660703633. Note that the first 3 decimals coincide. The cubic root of 138880 is about 51.7861036152.
The spelling of 138880 in words is "one hundred thirty-eight thousand, eight hundred eighty".