123312403 has 4 divisors (see below), whose sum is σ = 125001688. Its totient is φ = 121623120.

The previous prime is 123312359. The next prime is 123312421. The reversal of 123312403 is 304213321.

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 123312403 - 2⁹ = 123311891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123312473) 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, 844533 + ... + 844678.

It is an arithmetic number, because the mean of its divisors is an integer number (31250422).

Almost surely, 2^123312403 is an apocalyptic number.

123312403 is a deficient number, since it is larger than the sum of its proper divisors (1689285).

123312403 is an equidigital number, since it uses as much as digits as its factorization.

123312403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689284.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 123312403 is about 11104.6117897025. The cubic root of 123312403 is about 497.7396678616.

Adding to 123312403 its reverse (304213321), we get a palindrome (427525724).

The spelling of 123312403 in words is "one hundred twenty-three million, three hundred twelve thousand, four hundred three".