It is a nialpdrome in base 12.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 155820.
2155820 is an apocalyptic number.
155820 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 155820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (258552).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
155820 is a wasteful number, since it uses less digits than its factorization.
155820 is an odious number, because the sum of its binary digits is odd.
The square root of 155820 is about 394.7404210364. The cubic root of 155820 is about 53.8114134885.
The spelling of 155820 in words is "one hundred fifty-five thousand, eight hundred twenty".