128103 has 4 divisors (see below), whose sum is σ = 170808. Its totient is φ = 85400.

The previous prime is 128099. The next prime is 128111. The reversal of 128103 is 301821.

It is a happy number.

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 128103 - 2² = 128099 is a prime.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 128103.

It is not an unprimeable number, because it can be changed into a prime (128113) by changing a digit.

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, 21348 + ... + 21353.

It is an arithmetic number, because the mean of its divisors is an integer number (42702).

2¹²⁸¹⁰³ is an apocalyptic number.

128103 is a deficient number, since it is larger than the sum of its proper divisors (42705).

128103 is an equidigital number, since it uses as much as digits as its factorization.

128103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42704.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 128103 is about 357.9147943296. The cubic root of 128103 is about 50.4103562745.

Adding to 128103 its reverse (301821), we get a palindrome (429924).

It can be divided in two parts, 128 and 103, that added together give a triangular number (231 = T₂₁).

The spelling of 128103 in words is "one hundred twenty-eight thousand, one hundred three".