It is a self number, because there is not a number n which added to its sum of digits gives 122820.
It is a congruent number.
2122820 is an apocalyptic number.
122820 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 122820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181440).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
122820 is a wasteful number, since it uses less digits than its factorization.
122820 is an odious number, because the sum of its binary digits is odd.
The square root of 122820 is about 350.4568447042. The cubic root of 122820 is about 49.7076270266.
The spelling of 122820 in words is "one hundred twenty-two thousand, eight hundred twenty".