12840679 has 2 divisors, whose sum is σ = 12840680. Its totient is φ = 12840678.

The previous prime is 12840677. The next prime is 12840689. The reversal of 12840679 is 97604821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12840679 - 2¹ = 12840677 is a prime.

Together with 12840677, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12840677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6420339 + 6420340.

It is an arithmetic number, because the mean of its divisors is an integer number (6420340).

Almost surely, 2^12840679 is an apocalyptic number.

12840679 is a deficient number, since it is larger than the sum of its proper divisors (1).

12840679 is an equidigital number, since it uses as much as digits as its factorization.

12840679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 12840679 is about 3583.3893173921. The cubic root of 12840679 is about 234.1689614198.

The spelling of 12840679 in words is "twelve million, eight hundred forty thousand, six hundred seventy-nine".