123400431431 has 16 divisors (see below), whose sum is σ = 132549423840. Its totient is φ = 114523643520.

The previous prime is 123400431421. The next prime is 123400431443. The reversal of 123400431431 is 134134004321.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 123400431431 - 2⁶ = 123400431367 is a prime.

It is a super-2 number, since 2×123400431431² (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 123400431431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123400431421) 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, 563741 + ... + 751401.

It is an arithmetic number, because the mean of its divisors is an integer number (8284338990).

Almost surely, 2^123400431431 is an apocalyptic number.

123400431431 is a deficient number, since it is larger than the sum of its proper divisors (9148992409).

123400431431 is a wasteful number, since it uses less digits than its factorization.

123400431431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188386.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 123400431431 its reverse (134134004321), we get a palindrome (257534435752).

The spelling of 123400431431 in words is "one hundred twenty-three billion, four hundred million, four hundred thirty-one thousand, four hundred thirty-one".