2855 has 4 divisors (see below), whose sum is σ = 3432.
Its totient is φ = 2280.
The previous prime is 2851. The next prime is 2857. The reversal of 2855 is 5582.
It can be divided in two parts, 28 and 55, that multiplied together give a triangular number (1540 = T55).
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5582 = 2 ⋅2791.
It is not a de Polignac number, because 2855 - 22 = 2851 is a prime.
It is a Duffinian number.
It is a plaindrome in base 12.
It is a nialpdrome in base 15.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2851) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281 + ... + 290.
It is an arithmetic number, because the mean of its divisors is an integer number (858).
2855 is a deficient number, since it is larger than the sum of its proper divisors (577).
2855 is an equidigital number, since it uses as much as digits as its factorization.
2855 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 576.
The product of its digits is 400, while the sum is 20.
The square root of 2855 is about 53.4322000296.
The cubic root of 2855 is about 14.1862857739.
The spelling of 2855 in words is "two thousand, eight hundred fifty-five".