6813399 has 4 divisors (see below), whose sum is σ = 9084536. Its totient is φ = 4542264.

The previous prime is 6813371. The next prime is 6813403. The reversal of 6813399 is 9933186.

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

It is not a de Polignac number, because 6813399 - 2¹⁷ = 6682327 is a prime.

It is a D-number.

It is a Duffinian number.

6813399 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6813349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1135564 + ... + 1135569.

It is an arithmetic number, because the mean of its divisors is an integer number (2271134).

Almost surely, 2^6813399 is an apocalyptic number.

6813399 is a deficient number, since it is larger than the sum of its proper divisors (2271137).

6813399 is a wasteful number, since it uses less digits than its factorization.

6813399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271136.

The product of its digits is 34992, while the sum is 39.

The square root of 6813399 is about 2610.2488387125. The cubic root of 6813399 is about 189.5780015514.

The spelling of 6813399 in words is "six million, eight hundred thirteen thousand, three hundred ninety-nine".