845005 has 12 divisors (see below), whose sum is σ = 1179900. Its totient is φ = 579264.

The previous prime is 845003. The next prime is 845017. The reversal of 845005 is 500548.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 103684 + 741321 = 322^2 + 861^2 .

It is not a de Polignac number, because 845005 - 2¹ = 845003 is a prime.

845005 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (845003) 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 11 ways as a sum of consecutive naturals, for example, 1480 + ... + 1969.

It is an arithmetic number, because the mean of its divisors is an integer number (98325).

2⁸⁴⁵⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

845005 is a deficient number, since it is larger than the sum of its proper divisors (334895).

845005 is a wasteful number, since it uses less digits than its factorization.

845005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3468 (or 3461 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 845005 is about 919.2415351800. The cubic root of 845005 is about 94.5409059303.

It can be divided in two parts, 84500 and 5, that multiplied together give a square (422500 = 650²).

The spelling of 845005 in words is "eight hundred forty-five thousand, five".