12123503 has 4 divisors (see below), whose sum is σ = 13855440. Its totient is φ = 10391568.

The previous prime is 12123493. The next prime is 12123521. The reversal of 12123503 is 30532121.

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 12123503 - 2⁶ = 12123439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12123523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 865958 + ... + 865971.

It is an arithmetic number, because the mean of its divisors is an integer number (3463860).

Almost surely, 2^12123503 is an apocalyptic number.

12123503 is a deficient number, since it is larger than the sum of its proper divisors (1731937).

12123503 is an equidigital number, since it uses as much as digits as its factorization.

12123503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731936.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 12123503 is about 3481.8821059881. The cubic root of 12123503 is about 229.7255895584.

Adding to 12123503 its reverse (30532121), we get a palindrome (42655624).

The spelling of 12123503 in words is "twelve million, one hundred twenty-three thousand, five hundred three".