It is a tau number, because it is divible by the number of its divisors (240).
It is a zygodrome in base 2, base 12 and base 15.
It is a congruent number.
It is an unprimeable number.
21638000 is an apocalyptic number.
1638000 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 1638000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3520608).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1638000 is a wasteful number, since it uses less digits than its factorization.
1638000 is an evil number, because the sum of its binary digits is even.
The square root of 1638000 is about 1279.8437404621. The cubic root of 1638000 is about 117.8794133436.
The spelling of 1638000 in words is "one million, six hundred thirty-eight thousand".