123400420031 has 12 divisors (see below), whose sum is σ = 151102556280. Its totient is φ = 100204851600.

The previous prime is 123400420001. The next prime is 123400420043. The reversal of 123400420031 is 130024004321.

It is a de Polignac number, because none of the positive numbers 2^k-123400420031 is a prime.

It is a super-2 number, since 2×123400420031² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123400419985 and 123400420012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123400420001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66272120 + ... + 66273981.

It is an arithmetic number, because the mean of its divisors is an integer number (12591879690).

Almost surely, 2^123400420031 is an apocalyptic number.

123400420031 is a deficient number, since it is larger than the sum of its proper divisors (27702136249).

123400420031 is a wasteful number, since it uses less digits than its factorization.

123400420031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132546134 (or 132546127 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 123400420031 its reverse (130024004321), we get a palindrome (253424424352).

The spelling of 123400420031 in words is "one hundred twenty-three billion, four hundred million, four hundred twenty thousand, thirty-one".