2155220 has 12 divisors (see below), whose sum is σ = 4526004. Its totient is φ = 862080.

The previous prime is 2155207. The next prime is 2155253. The reversal of 2155220 is 225512.

2155220 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 795664 + 1359556 = 892^2 + 1166^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53861 + ... + 53900.

It is an arithmetic number, because the mean of its divisors is an integer number (377167).

2^2155220 is an apocalyptic number.

2155220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155220 is an abundant number, since it is smaller than the sum of its proper divisors (2370784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2155220 is a wasteful number, since it uses less digits than its factorization.

2155220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107770 (or 107768 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 2155220 is about 1468.0667559754. The cubic root of 2155220 is about 129.1706572938.

The spelling of 2155220 in words is "two million, one hundred fifty-five thousand, two hundred twenty".