123400234431 has 16 divisors (see below), whose sum is σ = 183825197920. Its totient is φ = 81812306880.

The previous prime is 123400234411. The next prime is 123400234459. The reversal of 123400234431 is 134432004321.

123400234431 is a `hidden beast` number, since 1 + 23 + 400 + 234 + 4 + 3 + 1 = 666.

It is not a de Polignac number, because 123400234431 - 2⁷ = 123400234303 is a prime.

It is a super-2 number, since 2×123400234431² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123400234395 and 123400234404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123400234411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12620470 + ... + 12630243.

It is an arithmetic number, because the mean of its divisors is an integer number (11489074870).

Almost surely, 2^123400234431 is an apocalyptic number.

123400234431 is a deficient number, since it is larger than the sum of its proper divisors (60424963489).

123400234431 is a wasteful number, since it uses less digits than its factorization.

123400234431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25250903 (or 25250897 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 123400234431 its reverse (134432004321), we get a palindrome (257832238752).

The spelling of 123400234431 in words is "one hundred twenty-three billion, four hundred million, two hundred thirty-four thousand, four hundred thirty-one".