12309216 has 24 divisors (see below), whose sum is σ = 32311944. Its totient is φ = 4103040.

The previous prime is 12309191. The next prime is 12309233. The reversal of 12309216 is 61290321.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 64015 + ... + 64206.

It is an arithmetic number, because the mean of its divisors is an integer number (1346331).

Almost surely, 2^12309216 is an apocalyptic number.

12309216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12309216 is an abundant number, since it is smaller than the sum of its proper divisors (20002728).

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

12309216 is a wasteful number, since it uses less digits than its factorization.

12309216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128234 (or 128226 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 12309216 is about 3508.4492300730. The cubic root of 12309216 is about 230.8926620371.

Adding to 12309216 its reverse (61290321), we get a palindrome (73599537).

The spelling of 12309216 in words is "twelve million, three hundred nine thousand, two hundred sixteen".