12609216 has 56 divisors (see below), whose sum is σ = 37073840. Its totient is φ = 4202496.

The previous prime is 12609173. The next prime is 12609227. The reversal of 12609216 is 61290621.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 12609216.

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, 1921 + ... + 5376.

Almost surely, 2^12609216 is an apocalyptic number.

12609216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12609216 is an abundant number, since it is smaller than the sum of its proper divisors (24464624).

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

12609216 is an equidigital number, since it uses as much as digits as its factorization.

12609216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7318 (or 7302 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 12609216 is about 3550.9457895045. The cubic root of 12609216 is about 232.7533969845.

Adding to 12609216 its reverse (61290621), we get a palindrome (73899837).

The spelling of 12609216 in words is "twelve million, six hundred nine thousand, two hundred sixteen".