128003 has 4 divisors (see below), whose sum is σ = 134760. Its totient is φ = 121248.

The previous prime is 127997. The next prime is 128021. The reversal of 128003 is 300821.

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 128003 - 2⁸ = 127747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128033) 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, 3350 + ... + 3387.

It is an arithmetic number, because the mean of its divisors is an integer number (33690).

2¹²⁸⁰⁰³ is an apocalyptic number.

128003 is a deficient number, since it is larger than the sum of its proper divisors (6757).

128003 is an equidigital number, since it uses as much as digits as its factorization.

128003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6756.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 128003 is about 357.7750690029. The cubic root of 128003 is about 50.3972357180.

Adding to 128003 its reverse (300821), we get a palindrome (428824).

The spelling of 128003 in words is "one hundred twenty-eight thousand, three".