686707 has 4 divisors (see below), whose sum is σ = 784816. Its totient is φ = 588600.

The previous prime is 686687. The next prime is 686723. The reversal of 686707 is 707686.

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 686707 - 2¹⁹ = 162419 is a prime.

It is a Duffinian number.

686707 is a lucky number.

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, 49044 + ... + 49057.

It is an arithmetic number, because the mean of its divisors is an integer number (196204).

2⁶⁸⁶⁷⁰⁷ is an apocalyptic number.

686707 is a deficient number, since it is larger than the sum of its proper divisors (98109).

686707 is an equidigital number, since it uses as much as digits as its factorization.

686707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98108.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 686707 is about 828.6778626221. The cubic root of 686707 is about 88.2247611915.

It can be divided in two parts, 68670 and 7, that multiplied together give a triangular number (480690 = T₉₈₀).

The spelling of 686707 in words is "six hundred eighty-six thousand, seven hundred seven".