2805605 has 16 divisors (see below), whose sum is σ = 3801600. Its totient is φ = 1968960.

The previous prime is 2805601. The next prime is 2805619. The reversal of 2805605 is 5065082.

It is not a de Polignac number, because 2805605 - 2² = 2805601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2805601) 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 15 ways as a sum of consecutive naturals, for example, 716 + ... + 2474.

It is an arithmetic number, because the mean of its divisors is an integer number (237600).

2^2805605 is an apocalyptic number.

It is an amenable number.

2805605 is a deficient number, since it is larger than the sum of its proper divisors (995995).

2805605 is a wasteful number, since it uses less digits than its factorization.

2805605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1804.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 2805605 is about 1674.9940298401. The cubic root of 2805605 is about 141.0399598359.

It can be divided in two parts, 280 and 5605, that added together give a palindrome (5885).

The spelling of 2805605 in words is "two million, eight hundred five thousand, six hundred five".