2006003 has 4 divisors (see below), whose sum is σ = 2021448. Its totient is φ = 1990560.

The previous prime is 2005981. The next prime is 2006009. The reversal of 2006003 is 3006002.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2006003 - 2⁸ = 2005747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2006009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7526 + ... + 7787.

It is an arithmetic number, because the mean of its divisors is an integer number (505362).

2^2006003 is an apocalyptic number.

2006003 is a deficient number, since it is larger than the sum of its proper divisors (15445).

2006003 is a wasteful number, since it uses less digits than its factorization.

2006003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15444.

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 2006003 is about 1416.3343531808. The cubic root of 2006003 is about 126.1180341823.

Subtracting 2006003 from its reverse (3006002), we obtain a palindrome (999999).

The spelling of 2006003 in words is "two million, six thousand, three".