686903 has 4 divisors (see below), whose sum is σ = 785040. Its totient is φ = 588768.

The previous prime is 686897. The next prime is 686911. The reversal of 686903 is 309686.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686903 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 686903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49058 + ... + 49071.

It is an arithmetic number, because the mean of its divisors is an integer number (196260).

2⁶⁸⁶⁹⁰³ is an apocalyptic number.

686903 is a deficient number, since it is larger than the sum of its proper divisors (98137).

686903 is an equidigital number, since it uses as much as digits as its factorization.

686903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98136.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 686903 is about 828.7961148558. The cubic root of 686903 is about 88.2331541006.

The spelling of 686903 in words is "six hundred eighty-six thousand, nine hundred three".