686607 has 4 divisors (see below), whose sum is σ = 915480. Its totient is φ = 457736.

The previous prime is 686593. The next prime is 686611. The reversal of 686607 is 706686.

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

It is a cyclic number.

It is not a de Polignac number, because 686607 - 2⁷ = 686479 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686687) 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, 114432 + ... + 114437.

It is an arithmetic number, because the mean of its divisors is an integer number (228870).

2⁶⁸⁶⁶⁰⁷ is an apocalyptic number.

686607 is a deficient number, since it is larger than the sum of its proper divisors (228873).

686607 is a wasteful number, since it uses less digits than its factorization.

686607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228872.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 686607 is about 828.6175233484. The cubic root of 686607 is about 88.2204784798.

The spelling of 686607 in words is "six hundred eighty-six thousand, six hundred seven".