12840109 has 2 divisors, whose sum is σ = 12840110. Its totient is φ = 12840108.

The previous prime is 12840103. The next prime is 12840131. The reversal of 12840109 is 90104821.

It is a happy number.

12840109 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12802084 + 38025 = 3578^2 + 195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12840109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12840103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6420054 + 6420055.

It is an arithmetic number, because the mean of its divisors is an integer number (6420055).

Almost surely, 2^12840109 is an apocalyptic number.

It is an amenable number.

12840109 is a deficient number, since it is larger than the sum of its proper divisors (1).

12840109 is an equidigital number, since it uses as much as digits as its factorization.

12840109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 12840109 is about 3583.3097828683. The cubic root of 12840109 is about 234.1654964347.

The spelling of 12840109 in words is "twelve million, eight hundred forty thousand, one hundred nine".