2045805 has 16 divisors (see below), whose sum is σ = 3386880. Its totient is φ = 1053248.

The previous prime is 2045789. The next prime is 2045819. The reversal of 2045805 is 5085402.

It is a cyclic number.

It is not a de Polignac number, because 2045805 - 2⁴ = 2045789 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1917 + ... + 2786.

It is an arithmetic number, because the mean of its divisors is an integer number (211680).

2^2045805 is an apocalyptic number.

It is an amenable number.

2045805 is a deficient number, since it is larger than the sum of its proper divisors (1341075).

2045805 is a wasteful number, since it uses less digits than its factorization.

2045805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4740.

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

The square root of 2045805 is about 1430.3163985636. The cubic root of 2045805 is about 126.9466988597.

It can be divided in two parts, 2045 and 805, that added together give a triangular number (2850 = T₇₅).

The spelling of 2045805 in words is "two million, forty-five thousand, eight hundred five".