6405943 has 2 divisors, whose sum is σ = 6405944. Its totient is φ = 6405942.

The previous prime is 6405941. The next prime is 6405979. The reversal of 6405943 is 3495046.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6405943 - 2¹ = 6405941 is a prime.

It is a super-2 number, since 2×6405943² = 82072211438498, which contains 22 as substring.

Together with 6405941, 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 (6405941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3202971 + 3202972.

It is an arithmetic number, because the mean of its divisors is an integer number (3202972).

Almost surely, 2^6405943 is an apocalyptic number.

6405943 is a deficient number, since it is larger than the sum of its proper divisors (1).

6405943 is an equidigital number, since it uses as much as digits as its factorization.

6405943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 6405943 is about 2530.9964440907. The cubic root of 6405943 is about 185.7210042371.

The spelling of 6405943 in words is "six million, four hundred five thousand, nine hundred forty-three".