12720347 has 2 divisors, whose sum is σ = 12720348. Its totient is φ = 12720346.

The previous prime is 12720317. The next prime is 12720349. The reversal of 12720347 is 74302721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12720347 - 2⁶ = 12720283 is a prime.

Together with 12720349, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12720349) 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 as a sum of consecutive naturals, namely, 6360173 + 6360174.

It is an arithmetic number, because the mean of its divisors is an integer number (6360174).

Almost surely, 2^12720347 is an apocalyptic number.

12720347 is a deficient number, since it is larger than the sum of its proper divisors (1).

12720347 is an equidigital number, since it uses as much as digits as its factorization.

12720347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 12720347 is about 3566.5595466780. The cubic root of 12720347 is about 233.4351865989.

The spelling of 12720347 in words is "twelve million, seven hundred twenty thousand, three hundred forty-seven".