2805005 has 18 divisors (see below), whose sum is σ = 3952494. Its totient is φ = 1905456.

The previous prime is 2805001. The next prime is 2805031. The reversal of 2805005 is 5005082.

2805005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2244004 + 561001 = 1498^2 + 749^2 .

It is not a de Polignac number, because 2805005 - 2² = 2805001 is a prime.

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2805001) 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 17 ways as a sum of consecutive naturals, for example, 26162 + ... + 26268.

It is an arithmetic number, because the mean of its divisors is an integer number (219583).

2^2805005 is an apocalyptic number.

It is an amenable number.

2805005 is a deficient number, since it is larger than the sum of its proper divisors (1147489).

2805005 is an equidigital number, since it uses as much as digits as its factorization.

2805005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 2805005 is about 1674.8149151473. The cubic root of 2805005 is about 141.0299049626.

Multiplying 2805005 by its sum of digits (20), we get a square (56100100 = 7490²).

The spelling of 2805005 in words is "two million, eight hundred five thousand, five".