6402779 has 2 divisors, whose sum is σ = 6402780. Its totient is φ = 6402778.

The previous prime is 6402751. The next prime is 6402787. The reversal of 6402779 is 9772046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6402779 - 2²⁰ = 5354203 is a prime.

It is not a weakly prime, because it can be changed into another prime (6402719) 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, 3201389 + 3201390.

It is an arithmetic number, because the mean of its divisors is an integer number (3201390).

Almost surely, 2^6402779 is an apocalyptic number.

6402779 is a deficient number, since it is larger than the sum of its proper divisors (1).

6402779 is an equidigital number, since it uses as much as digits as its factorization.

6402779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 6402779 is about 2530.3713166253. The cubic root of 6402779 is about 185.6904223212.

The spelling of 6402779 in words is "six million, four hundred two thousand, seven hundred seventy-nine".