Adding to 3420 its reverse (243), we get a palindrome (3663).
It is a tau number, because it is divible by the number of its divisors (36).
It is a congruent number.
It is an unprimeable number.
3420 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
3420 is a gapful number since it is divisible by the number (30) 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 3420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5460).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
3420 is a wasteful number, since it uses less digits than its factorization.
3420 is an odious number, because the sum of its binary digits is odd.
The square root of 3420 is about 58.4807660689. The cubic root of 3420 is about 15.0663725458.
The spelling of 3420 in words is "three thousand, four hundred twenty", and thus it is an iban number.