123138591852 has 12 divisors (see below), whose sum is σ = 287323381016. Its totient is φ = 41046197280.

The previous prime is 123138591847. The next prime is 123138591853. The reversal of 123138591852 is 258195831321.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×123138591852² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123138591853) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5130774649 + ... + 5130774672.

Almost surely, 2^123138591852 is an apocalyptic number.

123138591852 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

123138591852 is an abundant number, since it is smaller than the sum of its proper divisors (164184789164).

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

123138591852 is a wasteful number, since it uses less digits than its factorization.

123138591852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10261549328 (or 10261549326 counting only the distinct ones).

The product of its digits is 518400, while the sum is 48.

The spelling of 123138591852 in words is "one hundred twenty-three billion, one hundred thirty-eight million, five hundred ninety-one thousand, eight hundred fifty-two".