900005 has 4 divisors (see below), whose sum is σ = 1080012. Its totient is φ = 720000.

The previous prime is 900001. The next prime is 900007. The reversal of 900005 is 500009.

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

It can be written as a sum of positive squares in 2 ways, for example, as 693889 + 206116 = 833^2 + 454^2 .

It is not a de Polignac number, because 900005 - 2² = 900001 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (900001) 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 3 ways as a sum of consecutive naturals, for example, 89996 + ... + 90005.

It is an arithmetic number, because the mean of its divisors is an integer number (270003).

2⁹⁰⁰⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

900005 is a deficient number, since it is larger than the sum of its proper divisors (180007).

900005 is a wasteful number, since it uses less digits than its factorization.

900005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180006.

The product of its (nonzero) digits is 45, while the sum is 14.

The square root of 900005 is about 948.6859332782. The cubic root of 900005 is about 96.5491172546.

The spelling of 900005 in words is "nine hundred thousand, five".