4006003 has 4 divisors (see below), whose sum is σ = 4047400. Its totient is φ = 3964608.

The previous prime is 4006001. The next prime is 4006007. The reversal of 4006003 is 3006004.

4006003 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 4006003 - 2¹ = 4006001 is a prime.

It is the 2002-nd Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4006001) by changing a digit.

It is a nontrivial repunit in base 2001.

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 3 ways as a sum of consecutive naturals, for example, 20553 + ... + 20746.

It is an arithmetic number, because the mean of its divisors is an integer number (1011850).

Almost surely, 2^4006003 is an apocalyptic number.

4006003 is a deficient number, since it is larger than the sum of its proper divisors (41397).

4006003 is an equidigital number, since it uses as much as digits as its factorization.

4006003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41396.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 4006003 is about 2001.5001873595. The cubic root of 4006003 is about 158.8194752428.

Subtracting from 4006003 its reverse (3006004), we obtain a palindrome (999999).

The spelling of 4006003 in words is "four million, six thousand, three".