123383936538 has 24 divisors (see below), whose sum is σ = 267338459700. Its totient is φ = 41126963904.

The previous prime is 123383936537. The next prime is 123383936567. The reversal of 123383936538 is 835639383321.

It is a happy number.

123383936538 is a `hidden beast` number, since 1 + 23 + 3 + 83 + 9 + 3 + 6 + 538 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 105776504289 + 17607432249 = 325233^2 + 132693^2 .

It is a super-2 number, since 2×123383936538² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123383936531) 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, 1160268 + ... + 1262136.

Almost surely, 2^123383936538 is an apocalyptic number.

123383936538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

123383936538 is an abundant number, since it is smaller than the sum of its proper divisors (143954523162).

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

123383936538 is a wasteful number, since it uses less digits than its factorization.

123383936538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169166 (or 169163 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 54.

The spelling of 123383936538 in words is "one hundred twenty-three billion, three hundred eighty-three million, nine hundred thirty-six thousand, five hundred thirty-eight".