It is a self number, because there is not a number n which added to its sum of digits gives 2351220.
It is a congruent number.
It is an unprimeable number.
22351220 is an apocalyptic number.
2351220 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 practical number, because each smaller number is the sum of distinct divisors of 2351220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3326400).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
2351220 is a wasteful number, since it uses less digits than its factorization.
2351220 is an evil number, because the sum of its binary digits is even.
The square root of 2351220 is about 1533.3688401686. The cubic root of 2351220 is about 132.9732925437.
Adding to 2351220 its reverse (221532), we get a palindrome (2572752).
The spelling of 2351220 in words is "two million, three hundred fifty-one thousand, two hundred twenty".