123138591800 has 48 divisors (see below), whose sum is σ = 327196833360. Its totient is φ = 42218945280.

The previous prime is 123138591799. The next prime is 123138591803. The reversal of 123138591800 is 8195831321.

It is a super-2 number, since 2×123138591800² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123138591803) 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, 43976669 + ... + 43979468.

It is an arithmetic number, because the mean of its divisors is an integer number (6816600695).

Almost surely, 2^123138591800 is an apocalyptic number.

123138591800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123138591800 is an abundant number, since it is smaller than the sum of its proper divisors (204058241560).

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

123138591800 is a wasteful number, since it uses less digits than its factorization.

123138591800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87956160 (or 87956151 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 41.

The spelling of 123138591800 in words is "one hundred twenty-three billion, one hundred thirty-eight million, five hundred ninety-one thousand, eight hundred".