12138341958 has 24 divisors (see below), whose sum is σ = 27148120896. Its totient is φ = 3915594000.

The previous prime is 12138341923. The next prime is 12138342019. The reversal of 12138341958 is 85914383121.

12138341958 is a `hidden beast` number, since 1 + 213 + 8 + 341 + 95 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10876093 + ... + 10877208.

It is an arithmetic number, because the mean of its divisors is an integer number (1131171704).

Almost surely, 2^12138341958 is an apocalyptic number.

12138341958 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12138341958 is an abundant number, since it is smaller than the sum of its proper divisors (15009778938).

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

12138341958 is a wasteful number, since it uses less digits than its factorization.

12138341958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21753340 (or 21753337 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The spelling of 12138341958 in words is "twelve billion, one hundred thirty-eight million, three hundred forty-one thousand, nine hundred fifty-eight".