2255865 has 16 divisors (see below), whose sum is σ = 3672000. Its totient is φ = 1182272.

The previous prime is 2255837. The next prime is 2255867. The reversal of 2255865 is 5685522.

It is a cyclic number.

It is not a de Polignac number, because 2255865 - 2⁵ = 2255833 is a prime.

It is a d-powerful number, because it can be written as 2 + 2¹⁸ + 5² + 5² + 8⁵ + 6⁵ + 5⁹ .

It is not an unprimeable number, because it can be changed into a prime (2255867) 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, 390 + ... + 2159.

It is an arithmetic number, because the mean of its divisors is an integer number (229500).

2^2255865 is an apocalyptic number.

It is an amenable number.

2255865 is a deficient number, since it is larger than the sum of its proper divisors (1416135).

2255865 is a wasteful number, since it uses less digits than its factorization.

2255865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2616.

The product of its digits is 24000, while the sum is 33.

The square root of 2255865 is about 1501.9537276494. The cubic root of 2255865 is about 131.1508275786.

The spelling of 2255865 in words is "two million, two hundred fifty-five thousand, eight hundred sixty-five".