12909312 has 108 divisors (see below), whose sum is σ = 40176864. Its totient is φ = 3962880.

The previous prime is 12909283. The next prime is 12909313. The reversal of 12909312 is 21390921.

It is not an unprimeable number, because it can be changed into a prime (12909313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29737 + ... + 30167.

It is an arithmetic number, because the mean of its divisors is an integer number (372008).

Almost surely, 2^12909312 is an apocalyptic number.

12909312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12909312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20088432).

12909312 is an abundant number, since it is smaller than the sum of its proper divisors (27267552).

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

12909312 is a wasteful number, since it uses less digits than its factorization.

12909312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 12909312 is about 3592.9531029503. The cubic root of 12909312 is about 234.5854287211.

The spelling of 12909312 in words is "twelve million, nine hundred nine thousand, three hundred twelve".