4020003 has 24 divisors (see below), whose sum is σ = 6456240. Its totient is φ = 2471040.

The previous prime is 4019993. The next prime is 4020011. The reversal of 4020003 is 3000204.

It is not a de Polignac number, because 4020003 - 2¹⁰ = 4018979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (4020503) 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 in 23 ways as a sum of consecutive naturals, for example, 4123 + ... + 5003.

It is an arithmetic number, because the mean of its divisors is an integer number (269010).

Almost surely, 2^4020003 is an apocalyptic number.

4020003 is a deficient number, since it is larger than the sum of its proper divisors (2436237).

4020003 is a wasteful number, since it uses less digits than its factorization.

4020003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916 (or 897 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 9.

The square root of 4020003 is about 2004.9945137082. The cubic root of 4020003 is about 159.0042718681.

Adding to 4020003 its reverse (3000204), we get a palindrome (7020207).

The spelling of 4020003 in words is "four million, twenty thousand, three".