12139218 has 48 divisors (see below), whose sum is σ = 32375616. Its totient is φ = 3201120.

The previous prime is 12139189. The next prime is 12139229. The reversal of 12139218 is 81293121.

It is a super-2 number, since 2×12139218² = 294721227303048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12139191 and 12139200.

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 23 ways as a sum of consecutive naturals, for example, 2068 + ... + 5343.

It is an arithmetic number, because the mean of its divisors is an integer number (674492).

Almost surely, 2^12139218 is an apocalyptic number.

12139218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12139218 is an abundant number, since it is smaller than the sum of its proper divisors (20236398).

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

12139218 is a wasteful number, since it uses less digits than its factorization.

12139218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7439 (or 7436 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 12139218 is about 3484.1380569662. The cubic root of 12139218 is about 229.8248067261.

The spelling of 12139218 in words is "twelve million, one hundred thirty-nine thousand, two hundred eighteen".