6818393 has 4 divisors (see below), whose sum is σ = 7053540. Its totient is φ = 6583248.

The previous prime is 6818363. The next prime is 6818401. The reversal of 6818393 is 3938186.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2866249 + 3952144 = 1693^2 + 1988^2 .

It is a cyclic number.

It is not a de Polignac number, because 6818393 - 2⁸ = 6818137 is a prime.

It is a super-3 number, since 3×6818393³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6818303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117530 + ... + 117587.

It is an arithmetic number, because the mean of its divisors is an integer number (1763385).

Almost surely, 2^6818393 is an apocalyptic number.

It is an amenable number.

6818393 is a deficient number, since it is larger than the sum of its proper divisors (235147).

6818393 is a wasteful number, since it uses less digits than its factorization.

6818393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235146.

The product of its digits is 31104, while the sum is 38.

The square root of 6818393 is about 2611.2052772618. The cubic root of 6818393 is about 189.6243084104.

The spelling of 6818393 in words is "six million, eight hundred eighteen thousand, three hundred ninety-three".