12129718 has 8 divisors (see below), whose sum is σ = 18209448. Its totient is φ = 6059904.

The previous prime is 12129707. The next prime is 12129731. The reversal of 12129718 is 81792121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12129718.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 3030 + ... + 5782.

It is an arithmetic number, because the mean of its divisors is an integer number (2276181).

Almost surely, 2^12129718 is an apocalyptic number.

12129718 is the 2203-rd heptagonal number.

12129718 is a deficient number, since it is larger than the sum of its proper divisors (6079730).

12129718 is a wasteful number, since it uses less digits than its factorization.

12129718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4958.

The product of its digits is 2016, while the sum is 31.

The square root of 12129718 is about 3482.7744687246. The cubic root of 12129718 is about 229.7648384079.

The spelling of 12129718 in words is "twelve million, one hundred twenty-nine thousand, seven hundred eighteen".