6393866 has 4 divisors (see below), whose sum is σ = 9590802. Its totient is φ = 3196932.

The previous prime is 6393857. The next prime is 6393869. The reversal of 6393866 is 6683936.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3900625 + 2493241 = 1975^2 + 1579^2 .

It is not an unprimeable number, because it can be changed into a prime (6393869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1598465 + ... + 1598468.

Almost surely, 2^6393866 is an apocalyptic number.

6393866 is a deficient number, since it is larger than the sum of its proper divisors (3196936).

6393866 is a wasteful number, since it uses less digits than its factorization.

6393866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3196935.

The product of its digits is 139968, while the sum is 41.

The square root of 6393866 is about 2528.6094993098. The cubic root of 6393866 is about 185.6042187470.

The spelling of 6393866 in words is "six million, three hundred ninety-three thousand, eight hundred sixty-six".