It is a tau number, because it is divible by the number of its divisors (60).
It is a nialpdrome in base 9.
It is a zygodrome in base 9.
It is a congruent number.
393660 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
393660 is a Friedman number, since it can be written as (60*(6-3)^9)/3, using all its digits and the basic arithmetic operations.
2393660 is an apocalyptic number.
393660 is a gapful number since it is divisible by the number (30) 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 393660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (620004).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
393660 is an frugal number, since it uses more digits than its factorization.
393660 is an evil number, because the sum of its binary digits is even.
The square root of 393660 is about 627.4233020856. The cubic root of 393660 is about 73.2892756481.
The spelling of 393660 in words is "three hundred ninety-three thousand, six hundred sixty".