6404279 has 4 divisors (see below), whose sum is σ = 7319184. Its totient is φ = 5489376.

The previous prime is 6404269. The next prime is 6404297. The reversal of 6404279 is 9724046.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6404279 - 2⁴ = 6404263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6404239) 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 in 3 ways as a sum of consecutive naturals, for example, 457442 + ... + 457455.

It is an arithmetic number, because the mean of its divisors is an integer number (1829796).

Almost surely, 2^6404279 is an apocalyptic number.

6404279 is a deficient number, since it is larger than the sum of its proper divisors (914905).

6404279 is an equidigital number, since it uses as much as digits as its factorization.

6404279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914904.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 6404279 is about 2530.6676984543. The cubic root of 6404279 is about 185.7049219567.

The spelling of 6404279 in words is "six million, four hundred four thousand, two hundred seventy-nine".