It is a happy number.
It is a self number, because there is not a number n which added to its sum of digits gives 243420.
It is a congruent number.
2243420 is an apocalyptic number.
243420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
243420 is a wasteful number, since it uses less digits than its factorization.
243420 is an evil number, because the sum of its binary digits is even.
The square root of 243420 is about 493.3761242703. The cubic root of 243420 is about 62.4384460644.
Adding to 243420 its reverse (24342), we get a palindrome (267762).
The spelling of 243420 in words is "two hundred forty-three thousand, four hundred twenty", and thus it is an iban number.