123531612438 has 16 divisors (see below), whose sum is σ = 266068088496. Its totient is φ = 38009726880.

The previous prime is 123531612419. The next prime is 123531612487. The reversal of 123531612438 is 834216135321.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 123531612396 and 123531612405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 791869233 + ... + 791869388.

It is an arithmetic number, because the mean of its divisors is an integer number (16629255531).

Almost surely, 2^123531612438 is an apocalyptic number.

123531612438 is an abundant number, since it is smaller than the sum of its proper divisors (142536476058).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123531612438 is a wasteful number, since it uses less digits than its factorization.

123531612438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583738639.

The product of its digits is 103680, while the sum is 39.

Adding to 123531612438 its reverse (834216135321), we get a palindrome (957747747759).

The spelling of 123531612438 in words is "one hundred twenty-three billion, five hundred thirty-one million, six hundred twelve thousand, four hundred thirty-eight".