It is a congruent number.
It is an unprimeable number.
2138900 is an apocalyptic number.
138900 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 138900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201376).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
138900 is a wasteful number, since it uses less digits than its factorization.
138900 is an evil number, because the sum of its binary digits is even.
The square root of 138900 is about 372.6929030717. The cubic root of 138900 is about 51.7885893880.
The spelling of 138900 in words is "one hundred thirty-eight thousand, nine hundred".