2820855 has 16 divisors (see below), whose sum is σ = 4566240. Its totient is φ = 1486848.

The previous prime is 2820833. The next prime is 2820863. The reversal of 2820855 is 5580282.

It is not a de Polignac number, because 2820855 - 2⁶ = 2820791 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 279 + ... + 2391.

It is an arithmetic number, because the mean of its divisors is an integer number (285390).

2^2820855 is an apocalyptic number.

2820855 is a deficient number, since it is larger than the sum of its proper divisors (1745385).

2820855 is a wasteful number, since it uses less digits than its factorization.

2820855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2210.

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

The square root of 2820855 is about 1679.5401156269. The cubic root of 2820855 is about 141.2950413698.

The spelling of 2820855 in words is "two million, eight hundred twenty thousand, eight hundred fifty-five".