6909813 has 8 divisors (see below), whose sum is σ = 10236800. Its totient is φ = 4606524.

The previous prime is 6909781. The next prime is 6909817. The reversal of 6909813 is 3189096.

It is not a de Polignac number, because 6909813 - 2⁵ = 6909781 is a prime.

It is a super-4 number, since 4×6909813⁴ (a number of 28 digits) contains 4444 as substring.

It is a Duffinian number.

It is a Curzon number.

6909813 is a lucky number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6909817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127933 + ... + 127986.

It is an arithmetic number, because the mean of its divisors is an integer number (1279600).

Almost surely, 2^6909813 is an apocalyptic number.

It is an amenable number.

6909813 is a deficient number, since it is larger than the sum of its proper divisors (3326987).

6909813 is a wasteful number, since it uses less digits than its factorization.

6909813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255928 (or 255922 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 6909813 is about 2628.6523163020. The cubic root of 6909813 is about 190.4680335723.

The spelling of 6909813 in words is "six million, nine hundred nine thousand, eight hundred thirteen".