It is a happy number.
31428 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.
It is a self number, because there is not a number n which added to its sum of digits gives 31428.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 31428.
It is an unprimeable number.
31428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
231428 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 31428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41503).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
31428 is a wasteful number, since it uses less digits than its factorization.
31428 is an evil number, because the sum of its binary digits is even.
The square root of 31428 is about 177.2794404323. The cubic root of 31428 is about 31.5577173095.
The spelling of 31428 in words is "thirty-one thousand, four hundred twenty-eight".