6442993 has 2 divisors, whose sum is σ = 6442994. Its totient is φ = 6442992.

The previous prime is 6442981. The next prime is 6442999. The reversal of 6442993 is 3992446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3908529 + 2534464 = 1977^2 + 1592^2 .

It is a cyclic number.

It is not a de Polignac number, because 6442993 - 2⁹ = 6442481 is a prime.

It is a d-powerful number, because it can be written as 6² + 4² + 4⁸ + 2⁵ + 9² + 9⁷ + 3¹³ .

It is not a weakly prime, because it can be changed into another prime (6442999) 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, 3221496 + 3221497.

It is an arithmetic number, because the mean of its divisors is an integer number (3221497).

Almost surely, 2^6442993 is an apocalyptic number.

It is an amenable number.

6442993 is a deficient number, since it is larger than the sum of its proper divisors (1).

6442993 is an equidigital number, since it uses as much as digits as its factorization.

6442993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 37.

The square root of 6442993 is about 2538.3051432009. The cubic root of 6442993 is about 186.0783671774.

The spelling of 6442993 in words is "six million, four hundred forty-two thousand, nine hundred ninety-three".