12003 has 4 divisors (see below), whose sum is σ = 16008. Its totient is φ = 8000.

The previous prime is 11987. The next prime is 12007. The reversal of 12003 is 30021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30021 = 3 ⋅10007.

It is a cyclic number.

It is not a de Polignac number, because 12003 - 2⁴ = 11987 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 11982 and 12000.

It is not an unprimeable number, because it can be changed into a prime (12007) 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, 1998 + ... + 2003.

It is an arithmetic number, because the mean of its divisors is an integer number (4002).

2¹²⁰⁰³ is an apocalyptic number.

12003 is a deficient number, since it is larger than the sum of its proper divisors (4005).

12003 is an equidigital number, since it uses as much as digits as its factorization.

12003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4004.

The product of its (nonzero) digits is 6, while the sum is 6.

The square root of 12003 is about 109.5582037093. The cubic root of 12003 is about 22.8961925492.

Adding to 12003 its reverse (30021), we get a palindrome (42024).

It can be divided in two parts, 1200 and 3, that multiplied together give a square (3600 = 60²).

The spelling of 12003 in words is "twelve thousand, three", and thus it is an iban number.