2155855 has 16 divisors (see below), whose sum is σ = 2951424. Its totient is φ = 1497600.

The previous prime is 2155849. The next prime is 2155861. The reversal of 2155855 is 5585512.

2155855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2155849) and next prime (2155861).

It is not a de Polignac number, because 2155855 - 2¹⁵ = 2123087 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 130 + ... + 2080.

It is an arithmetic number, because the mean of its divisors is an integer number (184464).

2^2155855 is an apocalyptic number.

2155855 is a deficient number, since it is larger than the sum of its proper divisors (795569).

2155855 is a wasteful number, since it uses less digits than its factorization.

2155855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986.

The product of its digits is 10000, while the sum is 31.

The square root of 2155855 is about 1468.2830108668. The cubic root of 2155855 is about 129.1833420488.

The spelling of 2155855 in words is "two million, one hundred fifty-five thousand, eight hundred fifty-five".