7812 divided by its sum of digits (18) gives a palindrome (434).
Adding to 7812 its reverse (2187), we get a palindrome (9999).
Subtracting from 7812 its reverse (2187), we obtain a square (5625 = 752).
7812 is nontrivially palindromic in base 5.
It is a tau number, because it is divible by the number of its divisors (36).
It is an alternating number because its digits alternate between odd and even.
7812 is a nontrivial repdigit in base 5.
It is a plaindrome in base 5 and base 15.
It is a nialpdrome in base 5.
It is a zygodrome in base 5.
27812 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 7812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11648).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
7812 is a wasteful number, since it uses less digits than its factorization.
7812 is an evil number, because the sum of its binary digits is even.
The square root of 7812 is about 88.3855191759. The cubic root of 7812 is about 19.8420898336.
The spelling of 7812 in words is "seven thousand, eight hundred twelve".