2555220 has 48 divisors (see below), whose sum is σ = 7354368. Its totient is φ = 662400.

The previous prime is 2555213. The next prime is 2555221. The reversal of 2555220 is 225552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2555221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1645 + ... + 2795.

It is an arithmetic number, because the mean of its divisors is an integer number (153216).

2^2555220 is an apocalyptic number.

2555220 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 2555220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3677184).

2555220 is an abundant number, since it is smaller than the sum of its proper divisors (4799148).

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

2555220 is a wasteful number, since it uses less digits than its factorization.

2555220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200 (or 1198 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 2555220 is about 1598.5055520704. The cubic root of 2555220 is about 136.7128801344.

Multiplying 2555220 by its sum of digits (21), we get a triangular number (53659620 = T₁₀₃₅₉).

It can be divided in two parts, 2555 and 220, that added together give a triangular number (2775 = T₇₄).

The spelling of 2555220 in words is "two million, five hundred fifty-five thousand, two hundred twenty".