4001003 has 2 divisors, whose sum is σ = 4001004. Its totient is φ = 4001002.

The previous prime is 4000993. The next prime is 4001009. The reversal of 4001003 is 3001004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4001003 - 2⁴ = 4000987 is a prime.

It is not a weakly prime, because it can be changed into another prime (4001009) 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 as a sum of consecutive naturals, namely, 2000501 + 2000502.

It is an arithmetic number, because the mean of its divisors is an integer number (2000502).

Almost surely, 2^4001003 is an apocalyptic number.

4001003 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001003 is an equidigital number, since it uses as much as digits as its factorization.

4001003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 4001003 is about 2000.2507342831. The cubic root of 4001003 is about 158.7533721151.

Adding to 4001003 its reverse (3001004), we get a palindrome (7002007).

Subtracting from 4001003 its reverse (3001004), we obtain a palindrome (999999).

The spelling of 4001003 in words is "four million, one thousand, three".