2003666 has 16 divisors (see below), whose sum is σ = 3459456. Its totient is φ = 852576.

The previous prime is 2003663. The next prime is 2003669. The reversal of 2003666 is 6663002.

It is an interprime number because it is at equal distance from previous prime (2003663) and next prime (2003669).

It is not an unprimeable number, because it can be changed into a prime (2003663) 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, 1910 + ... + 2766.

It is an arithmetic number, because the mean of its divisors is an integer number (216216).

2^2003666 is an apocalyptic number.

2003666 is a deficient number, since it is larger than the sum of its proper divisors (1455790).

2003666 is a wasteful number, since it uses less digits than its factorization.

2003666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 2003666 is about 1415.5090956967. The cubic root of 2003666 is about 126.0690391780.

Adding to 2003666 its reverse (6663002), we get a palindrome (8666668).

It can be divided in two parts, 20036 and 66, that added together give a palindrome (20102).

The spelling of 2003666 in words is "two million, three thousand, six hundred sixty-six".