12156647 has 4 divisors (see below), whose sum is σ = 12167136. Its totient is φ = 12146160.

The previous prime is 12156643. The next prime is 12156671. The reversal of 12156647 is 74665121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 74665121 = 151 ⋅494471.

It is a cyclic number.

It is not a de Polignac number, because 12156647 - 2² = 12156643 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12156643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3254 + ... + 5907.

It is an arithmetic number, because the mean of its divisors is an integer number (3041784).

Almost surely, 2^12156647 is an apocalyptic number.

12156647 is a deficient number, since it is larger than the sum of its proper divisors (10489).

12156647 is an equidigital number, since it uses as much as digits as its factorization.

12156647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10488.

The product of its digits is 10080, while the sum is 32.

The square root of 12156647 is about 3486.6383523388. The cubic root of 12156647 is about 229.9347451930.

The spelling of 12156647 in words is "twelve million, one hundred fifty-six thousand, six hundred forty-seven".