It is a self number, because there is not a number n which added to its sum of digits gives 398780.
It is a congruent number.
It is an unprimeable number.
2398780 is an apocalyptic number.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
398780 is a wasteful number, since it uses less digits than its factorization.
398780 is an evil number, because the sum of its binary digits is even.
The square root of 398780 is about 631.4903007965. The cubic root of 398780 is about 73.6056450459.
The spelling of 398780 in words is "three hundred ninety-eight thousand, seven hundred eighty".