123404400431 has 4 divisors (see below), whose sum is σ = 132897046632. Its totient is φ = 113911754232.

The previous prime is 123404400421. The next prime is 123404400451. The reversal of 123404400431 is 134004404321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123404400431 is a prime.

It is a super-2 number, since 2×123404400431² (a number of 23 digits) contains 22 as substring.

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 123404400431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123404400421) 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, 4746323081 + ... + 4746323106.

It is an arithmetic number, because the mean of its divisors is an integer number (33224261658).

Almost surely, 2^123404400431 is an apocalyptic number.

123404400431 is a deficient number, since it is larger than the sum of its proper divisors (9492646201).

123404400431 is an equidigital number, since it uses as much as digits as its factorization.

123404400431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9492646200.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 123404400431 its reverse (134004404321), we get a palindrome (257408804752).

The spelling of 123404400431 in words is "one hundred twenty-three billion, four hundred four million, four hundred thousand, four hundred thirty-one".