123603 has 4 divisors (see below), whose sum is σ = 164808. Its totient is φ = 82400.

The previous prime is 123601. The next prime is 123619. The reversal of 123603 is 306321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 306321 = 3 ⋅102107.

It is a cyclic number.

It is not a de Polignac number, because 123603 - 2¹ = 123601 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (123601) 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, 20598 + ... + 20603.

It is an arithmetic number, because the mean of its divisors is an integer number (41202).

2¹²³⁶⁰³ is an apocalyptic number.

123603 is a deficient number, since it is larger than the sum of its proper divisors (41205).

123603 is an equidigital number, since it uses as much as digits as its factorization.

123603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41204.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 123603 is about 351.5721832000. The cubic root of 123603 is about 49.8130350872.

Adding to 123603 its reverse (306321), we get a palindrome (429924).

The spelling of 123603 in words is "one hundred twenty-three thousand, six hundred three".