12129538 has 8 divisors (see below), whose sum is σ = 18209088. Its totient is φ = 6059844.

The previous prime is 12129521. The next prime is 12129539. The reversal of 12129538 is 83592121.

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

It is not an unprimeable number, because it can be changed into a prime (12129539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3595 + ... + 6097.

It is an arithmetic number, because the mean of its divisors is an integer number (2276136).

Almost surely, 2^12129538 is an apocalyptic number.

12129538 is a deficient number, since it is larger than the sum of its proper divisors (6079550).

12129538 is a wasteful number, since it uses less digits than its factorization.

12129538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4928.

The product of its digits is 4320, while the sum is 31.

The square root of 12129538 is about 3482.7486271622. The cubic root of 12129538 is about 229.7637018639.

The spelling of 12129538 in words is "twelve million, one hundred twenty-nine thousand, five hundred thirty-eight".