Adding to 1220000 its reverse (221), we get a palindrome (1220221).
It is an Ulam number.
It is an unprimeable number.
21220000 is an apocalyptic number.
1220000 is a gapful number since it is divisible by the number (10) 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 1220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1525293).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1220000 is an frugal number, since it uses more digits than its factorization.
1220000 is an odious number, because the sum of its binary digits is odd.
The square root of 1220000 is about 1104.5361017187. The cubic root of 1220000 is about 106.8529730149.
The spelling of 1220000 in words is "one million, two hundred twenty thousand".