12117138 has 16 divisors (see below), whose sum is σ = 26437536. Its totient is φ = 3671840.

The previous prime is 12117121. The next prime is 12117221. The reversal of 12117138 is 83171121.

It is a happy number.

It is a super-2 number, since 2×12117138² = 293650066622088, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91731 + ... + 91862.

It is an arithmetic number, because the mean of its divisors is an integer number (1652346).

Almost surely, 2^12117138 is an apocalyptic number.

12117138 is an abundant number, since it is smaller than the sum of its proper divisors (14320398).

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

12117138 is a wasteful number, since it uses less digits than its factorization.

12117138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183609.

The product of its digits is 336, while the sum is 24.

The square root of 12117138 is about 3480.9679688271. The cubic root of 12117138 is about 229.6853795260.

Adding to 12117138 its reverse (83171121), we get a palindrome (95288259).

The spelling of 12117138 in words is "twelve million, one hundred seventeen thousand, one hundred thirty-eight".