905005 has 4 divisors (see below), whose sum is σ = 1086012. Its totient is φ = 724000.

The previous prime is 904999. The next prime is 905011. The reversal of 905005 is 500509.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (904999) and next prime (905011).

It can be written as a sum of positive squares in 2 ways, for example, as 660969 + 244036 = 813^2 + 494^2 .

It is not a de Polignac number, because 905005 - 2³ = 904997 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90496 + ... + 90505.

It is an arithmetic number, because the mean of its divisors is an integer number (271503).

2⁹⁰⁵⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

905005 is a deficient number, since it is larger than the sum of its proper divisors (181007).

905005 is a wasteful number, since it uses less digits than its factorization.

905005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181006.

The product of its (nonzero) digits is 225, while the sum is 19.

The square root of 905005 is about 951.3175074600. The cubic root of 905005 is about 96.7275808434.

Subtracting from 905005 its reverse (500509), we obtain a square (404496 = 636²).

The spelling of 905005 in words is "nine hundred five thousand, five".