12129258 has 16 divisors (see below), whose sum is σ = 25535520. Its totient is φ = 3830256.

The previous prime is 12129251. The next prime is 12129259. The reversal of 12129258 is 85292121.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12129251) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 53085 + ... + 53312.

It is an arithmetic number, because the mean of its divisors is an integer number (1595970).

Almost surely, 2^12129258 is an apocalyptic number.

12129258 is an abundant number, since it is smaller than the sum of its proper divisors (13406262).

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

12129258 is a wasteful number, since it uses less digits than its factorization.

12129258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106421.

The product of its digits is 2880, while the sum is 30.

The square root of 12129258 is about 3482.7084287950. The cubic root of 12129258 is about 229.7619338841.

The spelling of 12129258 in words is "twelve million, one hundred twenty-nine thousand, two hundred fifty-eight".