It is a congruent number.
Almost surely, 23420400 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 3420400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4359096).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
3420400 is a wasteful number, since it uses less digits than its factorization.
3420400 is an odious number, because the sum of its binary digits is odd.
The square root of 3420400 is about 1849.4323453428. The cubic root of 3420400 is about 150.6695990588.
Adding to 3420400 its reverse (40243), we get a palindrome (3460643).
The spelling of 3420400 in words is "three million, four hundred twenty thousand, four hundred".