686747 has 4 divisors (see below), whose sum is σ = 695520. Its totient is φ = 677976.

The previous prime is 686737. The next prime is 686761. The reversal of 686747 is 747686.

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 686747 - 2⁴ = 686731 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 686747.

It is not an unprimeable number, because it can be changed into a prime (686737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4268 + ... + 4425.

It is an arithmetic number, because the mean of its divisors is an integer number (173880).

2⁶⁸⁶⁷⁴⁷ is an apocalyptic number.

686747 is a deficient number, since it is larger than the sum of its proper divisors (8773).

686747 is an equidigital number, since it uses as much as digits as its factorization.

686747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8772.

The product of its digits is 56448, while the sum is 38.

The square root of 686747 is about 828.7019971015. The cubic root of 686747 is about 88.2264741598.

The spelling of 686747 in words is "six hundred eighty-six thousand, seven hundred forty-seven".