6816749 has 4 divisors (see below), whose sum is σ = 6831936. Its totient is φ = 6801564.

The previous prime is 6816743. The next prime is 6816757. The reversal of 6816749 is 9476186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6816749 - 2⁸ = 6816493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6816743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6899 + ... + 7824.

It is an arithmetic number, because the mean of its divisors is an integer number (1707984).

Almost surely, 2^6816749 is an apocalyptic number.

It is an amenable number.

6816749 is a deficient number, since it is larger than the sum of its proper divisors (15187).

6816749 is a wasteful number, since it uses less digits than its factorization.

6816749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15186.

The product of its digits is 72576, while the sum is 41.

The square root of 6816749 is about 2610.8904611262. The cubic root of 6816749 is about 189.6090669197.

The spelling of 6816749 in words is "six million, eight hundred sixteen thousand, seven hundred forty-nine".