6405899 has 2 divisors, whose sum is σ = 6405900. Its totient is φ = 6405898.

The previous prime is 6405877. The next prime is 6405901. The reversal of 6405899 is 9985046.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6405899 - 2⁸ = 6405643 is a prime.

Together with 6405901, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6405829) 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, 3202949 + 3202950.

It is an arithmetic number, because the mean of its divisors is an integer number (3202950).

Almost surely, 2^6405899 is an apocalyptic number.

6405899 is a deficient number, since it is larger than the sum of its proper divisors (1).

6405899 is an equidigital number, since it uses as much as digits as its factorization.

6405899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 6405899 is about 2530.9877518471. The cubic root of 6405899 is about 185.7205790203.

The spelling of 6405899 in words is "six million, four hundred five thousand, eight hundred ninety-nine".