6406879 has 2 divisors, whose sum is σ = 6406880. Its totient is φ = 6406878.

The previous prime is 6406877. The next prime is 6406913. The reversal of 6406879 is 9786046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6406879 - 2¹ = 6406877 is a prime.

Together with 6406877, 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 (6406877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3203439 + 3203440.

It is an arithmetic number, because the mean of its divisors is an integer number (3203440).

Almost surely, 2^6406879 is an apocalyptic number.

6406879 is a deficient number, since it is larger than the sum of its proper divisors (1).

6406879 is an equidigital number, since it uses as much as digits as its factorization.

6406879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 6406879 is about 2531.1813447479. The cubic root of 6406879 is about 185.7300492959.

The spelling of 6406879 in words is "six million, four hundred six thousand, eight hundred seventy-nine".