12009616 has 40 divisors (see below), whose sum is σ = 25043040. Its totient is φ = 5558784.

The previous prime is 12009593. The next prime is 12009623. The reversal of 12009616 is 61690021.

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, 17895 + ... + 18553.

It is an arithmetic number, because the mean of its divisors is an integer number (626076).

Almost surely, 2^12009616 is an apocalyptic number.

12009616 is a gapful number since it is divisible by the number (16) 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 12009616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12521520).

12009616 is an abundant number, since it is smaller than the sum of its proper divisors (13033424).

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

12009616 is a wasteful number, since it uses less digits than its factorization.

12009616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 751 (or 745 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 12009616 is about 3465.4892872436. The cubic root of 12009616 is about 229.0039853619.

Adding to 12009616 its reverse (61690021), we get a palindrome (73699637).

It can be divided in two parts, 1200 and 9616, that added together give a square (10816 = 104²).

The spelling of 12009616 in words is "twelve million, nine thousand, six hundred sixteen".