It is a happy number.
It is a Jordan-Polya number, since it can be written as (4!)2 ⋅ 3!.
3456 is nontrivially palindromic in base 11.
3456 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.
It is a tau number, because it is divible by the number of its divisors (32).
It is an Ulam number.
It is an alternating number because its digits alternate between odd and even.
It is a straight-line number, since its digits are in arithmetic progression.
It is a plaindrome in base 10 and base 14.
It is a nialpdrome in base 8, base 12 and base 16.
It is a zygodrome in base 8.
It is a congruent number.
3456 is a gapful number since it is divisible by the number (36) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 3456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5100).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
3456 is an equidigital number, since it uses as much as digits as its factorization.
3456 is an evil number, because the sum of its binary digits is even.
The square root of 3456 is about 58.7877538268. The cubic root of 3456 is about 15.1190525987.
Adding to 3456 its reverse (6543), we get a palindrome (9999).
The spelling of 3456 in words is "three thousand, four hundred fifty-six".