6389993 has 2 divisors, whose sum is σ = 6389994. Its totient is φ = 6389992.

The previous prime is 6389989. The next prime is 6390001. The reversal of 6389993 is 3999836.

6389993 is nontrivially palindromic in base 7.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5697769 + 692224 = 2387^2 + 832^2 .

It is a cyclic number.

It is not a de Polignac number, because 6389993 - 2² = 6389989 is a prime.

It is not a weakly prime, because it can be changed into another prime (6389953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3194996 + 3194997.

It is an arithmetic number, because the mean of its divisors is an integer number (3194997).

Almost surely, 2^6389993 is an apocalyptic number.

It is an amenable number.

6389993 is a deficient number, since it is larger than the sum of its proper divisors (1).

6389993 is an equidigital number, since it uses as much as digits as its factorization.

6389993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 47.

The square root of 6389993 is about 2527.8435473739. The cubic root of 6389993 is about 185.5667354085.

The spelling of 6389993 in words is "six million, three hundred eighty-nine thousand, nine hundred ninety-three".