2005783 has 4 divisors (see below), whose sum is σ = 2160088. Its totient is φ = 1851480.

The previous prime is 2005777. The next prime is 2005789. The reversal of 2005783 is 3875002.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2005777) and next prime (2005789).

It is a cyclic number.

It is not a de Polignac number, because 2005783 - 2¹³ = 1997591 is a prime.

It is a Duffinian number.

2005783 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005789) 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 3 ways as a sum of consecutive naturals, for example, 77133 + ... + 77158.

It is an arithmetic number, because the mean of its divisors is an integer number (540022).

2^2005783 is an apocalyptic number.

2005783 is a deficient number, since it is larger than the sum of its proper divisors (154305).

2005783 is a wasteful number, since it uses less digits than its factorization.

2005783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154304.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 2005783 is about 1416.2566857742. The cubic root of 2005783 is about 126.1134235242.

The spelling of 2005783 in words is "two million, five thousand, seven hundred eighty-three".