6686906 has 4 divisors (see below), whose sum is σ = 10030362. Its totient is φ = 3343452.

The previous prime is 6686893. The next prime is 6686909. The reversal of 6686906 is 6096866.

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

It can be written as a sum of positive squares in only one way, i.e., 4558225 + 2128681 = 2135^2 + 1459^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6686909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1671725 + ... + 1671728.

Almost surely, 2^6686906 is an apocalyptic number.

6686906 is a deficient number, since it is larger than the sum of its proper divisors (3343456).

6686906 is a wasteful number, since it uses less digits than its factorization.

6686906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3343455.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 6686906 is about 2585.9052573519. The cubic root of 6686906 is about 188.3974727807.

The spelling of 6686906 in words is "six million, six hundred eighty-six thousand, nine hundred six".