12840811 has 2 divisors, whose sum is σ = 12840812. Its totient is φ = 12840810.

The previous prime is 12840799. The next prime is 12840833. The reversal of 12840811 is 11804821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12840811 - 2⁹ = 12840299 is a prime.

It is not a weakly prime, because it can be changed into another prime (12840871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6420405 + 6420406.

It is an arithmetic number, because the mean of its divisors is an integer number (6420406).

Almost surely, 2^12840811 is an apocalyptic number.

12840811 is a deficient number, since it is larger than the sum of its proper divisors (1).

12840811 is an equidigital number, since it uses as much as digits as its factorization.

12840811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 12840811 is about 3583.4077356617. The cubic root of 12840811 is about 234.1697638228.

The spelling of 12840811 in words is "twelve million, eight hundred forty thousand, eight hundred eleven".