12909216 has 24 divisors (see below), whose sum is σ = 33886944. Its totient is φ = 4303040.

The previous prime is 12909179. The next prime is 12909217. The reversal of 12909216 is 61290921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12909217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67140 + ... + 67331.

It is an arithmetic number, because the mean of its divisors is an integer number (1411956).

Almost surely, 2^12909216 is an apocalyptic number.

12909216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12909216 is an abundant number, since it is smaller than the sum of its proper divisors (20977728).

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

12909216 is a wasteful number, since it uses less digits than its factorization.

12909216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134484 (or 134476 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 12909216 is about 3592.9397434413. The cubic root of 12909216 is about 234.5848472220.

The spelling of 12909216 in words is "twelve million, nine hundred nine thousand, two hundred sixteen".