605905 has 4 divisors (see below), whose sum is σ = 727092. Its totient is φ = 484720.

The previous prime is 605893. The next prime is 605909. The reversal of 605905 is 509506.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 509506 = 2 ⋅254753.

It can be written as a sum of positive squares in 2 ways, for example, as 374544 + 231361 = 612^2 + 481^2 .

It is not a de Polignac number, because 605905 - 2⁵ = 605873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 605905.

It is not an unprimeable number, because it can be changed into a prime (605909) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 60586 + ... + 60595.

It is an arithmetic number, because the mean of its divisors is an integer number (181773).

2⁶⁰⁵⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

605905 is a deficient number, since it is larger than the sum of its proper divisors (121187).

605905 is a wasteful number, since it uses less digits than its factorization.

605905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121186.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 605905 is about 778.3989979439. The cubic root of 605905 is about 84.6190565264.

The spelling of 605905 in words is "six hundred five thousand, nine hundred five".