12720247 has 2 divisors, whose sum is σ = 12720248. Its totient is φ = 12720246.

The previous prime is 12720229. The next prime is 12720271. The reversal of 12720247 is 74202721.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12720247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12720047) 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, 6360123 + 6360124.

It is an arithmetic number, because the mean of its divisors is an integer number (6360124).

Almost surely, 2^12720247 is an apocalyptic number.

12720247 is a deficient number, since it is larger than the sum of its proper divisors (1).

12720247 is an equidigital number, since it uses as much as digits as its factorization.

12720247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 12720247 is about 3566.5455275378. The cubic root of 12720247 is about 233.4345748866.

Adding to 12720247 its reverse (74202721), we get a palindrome (86922968).

The spelling of 12720247 in words is "twelve million, seven hundred twenty thousand, two hundred forty-seven".