12547216 has 30 divisors (see below), whose sum is σ = 26725286. Its totient is φ = 5702400.

The previous prime is 12547187. The next prime is 12547237. The reversal of 12547216 is 61274521.

It can be written as a sum of positive squares in only one way, i.e., 12390400 + 156816 = 3520^2 + 396^2 .

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

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 5 ways as a sum of consecutive naturals, for example, 1305 + ... + 5176.

Almost surely, 2^12547216 is an apocalyptic number.

12547216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12547216 is an abundant number, since it is smaller than the sum of its proper divisors (14178070).

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

12547216 is a wasteful number, since it uses less digits than its factorization.

12547216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6511 (or 6494 counting only the distinct ones).

The product of its digits is 3360, while the sum is 28.

The square root of 12547216 is about 3542.2049630139. The cubic root of 12547216 is about 232.3712842093.

The spelling of 12547216 in words is "twelve million, five hundred forty-seven thousand, two hundred sixteen".