6499943 has 2 divisors, whose sum is σ = 6499944. Its totient is φ = 6499942.

The previous prime is 6499939. The next prime is 6499949. The reversal of 6499943 is 3499946.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6499943 - 2² = 6499939 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6499894 and 6499903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6499949) 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, 3249971 + 3249972.

It is an arithmetic number, because the mean of its divisors is an integer number (3249972).

Almost surely, 2^6499943 is an apocalyptic number.

6499943 is a deficient number, since it is larger than the sum of its proper divisors (1).

6499943 is an equidigital number, since it uses as much as digits as its factorization.

6499943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 44.

The square root of 6499943 is about 2549.4985781522. The cubic root of 6499943 is about 186.6250123184.

The spelling of 6499943 in words is "six million, four hundred ninety-nine thousand, nine hundred forty-three".