Adding to 31400 its reverse (413), we get a palindrome (31813).
It is an unprimeable number.
231400 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 31400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36735).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
31400 is a wasteful number, since it uses less digits than its factorization.
31400 is an evil number, because the sum of its binary digits is even.
The square root of 31400 is about 177.2004514667. The cubic root of 31400 is about 31.5483426688.
The spelling of 31400 in words is "thirty-one thousand, four hundred".