123403503 has 8 divisors (see below), whose sum is σ = 164590000. Its totient is φ = 82243008.

The previous prime is 123403457. The next prime is 123403523. The reversal of 123403503 is 305304321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123403503 - 2¹² = 123399407 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123403503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123403523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12573 + ... + 20121.

It is an arithmetic number, because the mean of its divisors is an integer number (20573750).

Almost surely, 2^123403503 is an apocalyptic number.

123403503 is a deficient number, since it is larger than the sum of its proper divisors (41186497).

123403503 is an equidigital number, since it uses as much as digits as its factorization.

123403503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13001.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 123403503 is about 11108.7129317487. The cubic root of 123403503 is about 497.8622100684.

Adding to 123403503 its reverse (305304321), we get a palindrome (428707824).

The spelling of 123403503 in words is "one hundred twenty-three million, four hundred three thousand, five hundred three".