2255905 has 4 divisors (see below), whose sum is σ = 2707092. Its totient is φ = 1804720.

The previous prime is 2255899. The next prime is 2255947. The reversal of 2255905 is 5095522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5095522 = 2 ⋅2547761.

It can be written as a sum of positive squares in 2 ways, for example, as 1411344 + 844561 = 1188^2 + 919^2 .

It is not a de Polignac number, because 2255905 - 2¹¹ = 2253857 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225586 + ... + 225595.

It is an arithmetic number, because the mean of its divisors is an integer number (676773).

2^2255905 is an apocalyptic number.

It is an amenable number.

2255905 is a deficient number, since it is larger than the sum of its proper divisors (451187).

2255905 is an equidigital number, since it uses as much as digits as its factorization.

2255905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451186.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 2255905 is about 1501.9670435799. The cubic root of 2255905 is about 131.1516027435.

It can be divided in two parts, 2255 and 905, that added together give a triangular number (3160 = T₇₉).

The spelling of 2255905 in words is "two million, two hundred fifty-five thousand, nine hundred five".