6816393 has 12 divisors (see below), whose sum is σ = 10210928. Its totient is φ = 4544100.

The previous prime is 6816367. The next prime is 6816401. The reversal of 6816393 is 3936186.

It is a happy number.

It is not a de Polignac number, because 6816393 - 2⁵ = 6816361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6816493) 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 in 11 ways as a sum of consecutive naturals, for example, 13783 + ... + 14268.

Almost surely, 2^6816393 is an apocalyptic number.

It is an amenable number.

6816393 is a deficient number, since it is larger than the sum of its proper divisors (3394535).

6816393 is an equidigital number, since it uses as much as digits as its factorization.

6816393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28066 (or 28054 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 6816393 is about 2610.8222842622. The cubic root of 6816393 is about 189.6057661281.

It can be divided in two parts, 68 and 16393, that added together give a palindrome (16461).

The spelling of 6816393 in words is "six million, eight hundred sixteen thousand, three hundred ninety-three".