6685309 has 4 divisors (see below), whose sum is σ = 6709216. Its totient is φ = 6661404.

The previous prime is 6685307. The next prime is 6685331. The reversal of 6685309 is 9035866.

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 6685309 - 2¹ = 6685307 is a prime.

It is a Duffinian number.

6685309 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6685303) 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, 11529 + ... + 12094.

It is an arithmetic number, because the mean of its divisors is an integer number (1677304).

Almost surely, 2^6685309 is an apocalyptic number.

It is an amenable number.

6685309 is a deficient number, since it is larger than the sum of its proper divisors (23907).

6685309 is a wasteful number, since it uses less digits than its factorization.

6685309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23906.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 6685309 is about 2585.5964495644. The cubic root of 6685309 is about 188.3824735808.

The spelling of 6685309 in words is "six million, six hundred eighty-five thousand, three hundred nine".