2005665 has 8 divisors (see below), whose sum is σ = 3209088. Its totient is φ = 1069680.

The previous prime is 2005613. The next prime is 2005667. The reversal of 2005665 is 5665002.

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

It is not a de Polignac number, because 2005665 - 2¹⁰ = 2004641 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2005667) 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 7 ways as a sum of consecutive naturals, for example, 66841 + ... + 66870.

It is an arithmetic number, because the mean of its divisors is an integer number (401136).

2^2005665 is an apocalyptic number.

It is an amenable number.

2005665 is a deficient number, since it is larger than the sum of its proper divisors (1203423).

2005665 is a wasteful number, since it uses less digits than its factorization.

2005665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133719.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 2005665 is about 1416.2150260465. The cubic root of 2005665 is about 126.1109503959.

The spelling of 2005665 in words is "two million, five thousand, six hundred sixty-five".