213870 is nontrivially palindromic in base 13.
213870 is an esthetic number in base 3, because in such base its adjacent digits differ by 1.
It is a congruent number.
It is an unprimeable number.
2213870 is an apocalyptic number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
213870 is a wasteful number, since it uses less digits than its factorization.
213870 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 7139.
The square root of 213870 is about 462.4608091504. The cubic root of 213870 is about 59.8021259260.
The spelling of 213870 in words is "two hundred thirteen thousand, eight hundred seventy".