123387693138 has 24 divisors (see below), whose sum is σ = 267350479500. Its totient is φ = 41127619104.

The previous prime is 123387693119. The next prime is 123387693161. The reversal of 123387693138 is 831396783321.

123387693138 is a `hidden beast` number, since 123 + 387 + 6 + 9 + 3 + 138 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 117640082169 + 5747610969 = 342987^2 + 75813^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 393828 + ... + 633936.

Almost surely, 2^123387693138 is an apocalyptic number.

123387693138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

123387693138 is an abundant number, since it is smaller than the sum of its proper divisors (143962786362).

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

123387693138 is a wasteful number, since it uses less digits than its factorization.

123387693138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268666 (or 268663 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The spelling of 123387693138 in words is "one hundred twenty-three billion, three hundred eighty-seven million, six hundred ninety-three thousand, one hundred thirty-eight".