6686385 has 32 divisors (see below), whose sum is σ = 11664000. Its totient is φ = 3257856.

The previous prime is 6686363. The next prime is 6686413. The reversal of 6686385 is 5836866.

It is not a de Polignac number, because 6686385 - 2¹² = 6682289 is a prime.

It is an Ulam number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7861 + ... + 8669.

It is an arithmetic number, because the mean of its divisors is an integer number (364500).

Almost surely, 2^6686385 is an apocalyptic number.

It is an amenable number.

6686385 is a deficient number, since it is larger than the sum of its proper divisors (4977615).

6686385 is a wasteful number, since it uses less digits than its factorization.

6686385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865.

The product of its digits is 207360, while the sum is 42.

The square root of 6686385 is about 2585.8045169734. The cubic root of 6686385 is about 188.3925797538.

The spelling of 6686385 in words is "six million, six hundred eighty-six thousand, three hundred eighty-five".