12947661 has 8 divisors (see below), whose sum is σ = 19181760. Its totient is φ = 8631756.

The previous prime is 12947651. The next prime is 12947681. The reversal of 12947661 is 16674921.

12947661 is a `hidden beast` number, since 129 + 476 + 61 = 666.

It is not a de Polignac number, because 12947661 - 2¹¹ = 12945613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12947621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239745 + ... + 239798.

It is an arithmetic number, because the mean of its divisors is an integer number (2397720).

Almost surely, 2^12947661 is an apocalyptic number.

It is an amenable number.

12947661 is a deficient number, since it is larger than the sum of its proper divisors (6234099).

12947661 is an equidigital number, since it uses as much as digits as its factorization.

12947661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479552 (or 479546 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 12947661 is about 3598.2858418975. The cubic root of 12947661 is about 234.8174891951.

The spelling of 12947661 in words is "twelve million, nine hundred forty-seven thousand, six hundred sixty-one".