12129312 has 48 divisors (see below), whose sum is σ = 34292160. Its totient is φ = 3731712.

The previous prime is 12129287. The next prime is 12129343. The reversal of 12129312 is 21392121.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3612 + ... + 6107.

It is an arithmetic number, because the mean of its divisors is an integer number (714420).

Almost surely, 2^12129312 is an apocalyptic number.

12129312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12129312 is an abundant number, since it is smaller than the sum of its proper divisors (22162848).

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

12129312 is a wasteful number, since it uses less digits than its factorization.

12129312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9745 (or 9737 counting only the distinct ones).

The product of its digits is 216, while the sum is 21.

The square root of 12129312 is about 3482.7161813734. The cubic root of 12129312 is about 229.7622748538.

The spelling of 12129312 in words is "twelve million, one hundred twenty-nine thousand, three hundred twelve".