2005845 has 8 divisors (see below), whose sum is σ = 3209376. Its totient is φ = 1069776.

The previous prime is 2005841. The next prime is 2005859. The reversal of 2005845 is 5485002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2005845 - 2² = 2005841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005841) 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 7 ways as a sum of consecutive naturals, for example, 66847 + ... + 66876.

It is an arithmetic number, because the mean of its divisors is an integer number (401172).

2^2005845 is an apocalyptic number.

It is an amenable number.

2005845 is a deficient number, since it is larger than the sum of its proper divisors (1203531).

2005845 is a wasteful number, since it uses less digits than its factorization.

2005845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133731.

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 2005845 is about 1416.2785742925. The cubic root of 2005845 is about 126.1147229256.

It can be divided in two parts, 2005 and 845, that added together give a triangular number (2850 = T₇₅).

The spelling of 2005845 in words is "two million, five thousand, eight hundred forty-five".