12780247 has 2 divisors, whose sum is σ = 12780248. Its totient is φ = 12780246.

The previous prime is 12780223. The next prime is 12780263. The reversal of 12780247 is 74208721.

12780247 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12780247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12780347) 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, 6390123 + 6390124.

It is an arithmetic number, because the mean of its divisors is an integer number (6390124).

Almost surely, 2^12780247 is an apocalyptic number.

12780247 is a deficient number, since it is larger than the sum of its proper divisors (1).

12780247 is an equidigital number, since it uses as much as digits as its factorization.

12780247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 12780247 is about 3574.9471324762. The cubic root of 12780247 is about 233.8010276847.

Adding to 12780247 its reverse (74208721), we get a palindrome (86988968).

The spelling of 12780247 in words is "twelve million, seven hundred eighty thousand, two hundred forty-seven".