123404040203 has 2 divisors, whose sum is σ = 123404040204. Its totient is φ = 123404040202.

The previous prime is 123404040143. The next prime is 123404040211. The reversal of 123404040203 is 302040404321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123404040203 - 2⁸ = 123404039947 is a prime.

It is not a weakly prime, because it can be changed into another prime (123404040293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61702020101 + 61702020102.

It is an arithmetic number, because the mean of its divisors is an integer number (61702020102).

Almost surely, 2^123404040203 is an apocalyptic number.

123404040203 is a deficient number, since it is larger than the sum of its proper divisors (1).

123404040203 is an equidigital number, since it uses as much as digits as its factorization.

123404040203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 123404040203 its reverse (302040404321), we get a palindrome (425444444524).

The spelling of 123404040203 in words is "one hundred twenty-three billion, four hundred four million, forty thousand, two hundred three".