2855820 has 48 divisors (see below), whose sum is σ = 8725248. Its totient is φ = 692160.

The previous prime is 2855819. The next prime is 2855843. The reversal of 2855820 is 285582.

2855820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1504 + ... + 2823.

It is an arithmetic number, because the mean of its divisors is an integer number (181776).

2^2855820 is an apocalyptic number.

2855820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2855820 is an abundant number, since it is smaller than the sum of its proper divisors (5869428).

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

2855820 is a wasteful number, since it uses less digits than its factorization.

2855820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4350 (or 4348 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 30.

The square root of 2855820 is about 1689.9171577329. The cubic root of 2855820 is about 141.8764381723.

It can be divided in two parts, 285 and 5820, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 2855820 in words is "two million, eight hundred fifty-five thousand, eight hundred twenty".