12840547 has 2 divisors, whose sum is σ = 12840548. Its totient is φ = 12840546.

The previous prime is 12840539. The next prime is 12840551. The reversal of 12840547 is 74504821.

12840547 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 not a de Polignac number, because 12840547 - 2³ = 12840539 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12844547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6420273 + 6420274.

It is an arithmetic number, because the mean of its divisors is an integer number (6420274).

Almost surely, 2^12840547 is an apocalyptic number.

12840547 is a deficient number, since it is larger than the sum of its proper divisors (1).

12840547 is an equidigital number, since it uses as much as digits as its factorization.

12840547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 12840547 is about 3583.3708990279. The cubic root of 12840547 is about 234.1681590113.

The spelling of 12840547 in words is "twelve million, eight hundred forty thousand, five hundred forty-seven".