906005 has 4 divisors (see below), whose sum is σ = 1087212. Its totient is φ = 724800.

The previous prime is 905999. The next prime is 906007. The reversal of 906005 is 500609.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 500609 = 269 ⋅1861.

It can be written as a sum of positive squares in 2 ways, for example, as 682276 + 223729 = 826^2 + 473^2 .

It is not a de Polignac number, because 906005 - 2¹² = 901909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (906007) 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, 90596 + ... + 90605.

It is an arithmetic number, because the mean of its divisors is an integer number (271803).

2⁹⁰⁶⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

906005 is a deficient number, since it is larger than the sum of its proper divisors (181207).

906005 is a wasteful number, since it uses less digits than its factorization.

906005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181206.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 906005 is about 951.8429492306. The cubic root of 906005 is about 96.7631946341.

The spelling of 906005 in words is "nine hundred six thousand, five".