12138138 has 24 divisors (see below), whose sum is σ = 26558688. Its totient is φ = 4006152.

The previous prime is 12138127. The next prime is 12138151. The reversal of 12138138 is 83183121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1420 + ... + 5127.

It is an arithmetic number, because the mean of its divisors is an integer number (1106612).

Almost surely, 2^12138138 is an apocalyptic number.

12138138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12138138 is an abundant number, since it is smaller than the sum of its proper divisors (14420550).

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

12138138 is a wasteful number, since it uses less digits than its factorization.

12138138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6658 (or 6655 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 12138138 is about 3483.9830654009. The cubic root of 12138138 is about 229.8179908517.

The spelling of 12138138 in words is "twelve million, one hundred thirty-eight thousand, one hundred thirty-eight".