12138139992 has 32 divisors (see below), whose sum is σ = 33104018880. Its totient is φ = 3678224160.

The previous prime is 12138139963. The next prime is 12138139997. The reversal of 12138139992 is 29993183121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12138139997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22988638 + ... + 22989165.

It is an arithmetic number, because the mean of its divisors is an integer number (1034500590).

Almost surely, 2^12138139992 is an apocalyptic number.

12138139992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12138139992 is an abundant number, since it is smaller than the sum of its proper divisors (20965878888).

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

12138139992 is a wasteful number, since it uses less digits than its factorization.

12138139992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45977823 (or 45977819 counting only the distinct ones).

The product of its digits is 209952, while the sum is 48.

The spelling of 12138139992 in words is "twelve billion, one hundred thirty-eight million, one hundred thirty-nine thousand, nine hundred ninety-two".