123404040403 has 16 divisors (see below), whose sum is σ = 148239290880. Its totient is φ = 100437454656.

The previous prime is 123404040401. The next prime is 123404040421. The reversal of 123404040403 is 304040404321.

It is not a de Polignac number, because 123404040403 - 2¹ = 123404040401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123404040401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2775333 + ... + 2819446.

It is an arithmetic number, because the mean of its divisors is an integer number (9264955680).

Almost surely, 2^123404040403 is an apocalyptic number.

123404040403 is a deficient number, since it is larger than the sum of its proper divisors (24835250477).

123404040403 is a wasteful number, since it uses less digits than its factorization.

123404040403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5594946.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 123404040403 its reverse (304040404321), we get a palindrome (427444444724).

The spelling of 123404040403 in words is "one hundred twenty-three billion, four hundred four million, forty thousand, four hundred three".