It is a sphenic number, since it is the product of 3 distinct primes.
It is a self number, because there is not a number n which added to its sum of digits gives 420406.
It is a congruent number.
It is an unprimeable number.
2420406 is an apocalyptic number.
420406 is a wasteful number, since it uses less digits than its factorization.
420406 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 30038.
The square root of 420406 is about 648.3872299791. The cubic root of 420406 is about 74.9128469119.
The spelling of 420406 in words is "four hundred twenty thousand, four hundred six".