6440459 has 2 divisors, whose sum is σ = 6440460. Its totient is φ = 6440458.

The previous prime is 6440453. The next prime is 6440471. The reversal of 6440459 is 9540446.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6440459 - 2⁴ = 6440443 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6440453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3220229 + 3220230.

It is an arithmetic number, because the mean of its divisors is an integer number (3220230).

Almost surely, 2^6440459 is an apocalyptic number.

6440459 is a deficient number, since it is larger than the sum of its proper divisors (1).

6440459 is an equidigital number, since it uses as much as digits as its factorization.

6440459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 6440459 is about 2537.8059421477. The cubic root of 6440459 is about 186.0539693853.

The spelling of 6440459 in words is "six million, four hundred forty thousand, four hundred fifty-nine".