686743 has 4 divisors (see below), whose sum is σ = 708928. Its totient is φ = 664560.

The previous prime is 686737. The next prime is 686761. The reversal of 686743 is 347686.

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 686743 - 2¹⁷ = 555671 is a prime.

It is a Duffinian number.

686743 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 686699 and 686708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686723) 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, 11046 + ... + 11107.

It is an arithmetic number, because the mean of its divisors is an integer number (177232).

2⁶⁸⁶⁷⁴³ is an apocalyptic number.

686743 is a deficient number, since it is larger than the sum of its proper divisors (22185).

686743 is a wasteful number, since it uses less digits than its factorization.

686743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22184.

The product of its digits is 24192, while the sum is 34.

The square root of 686743 is about 828.6995836852. The cubic root of 686743 is about 88.2263028659.

The spelling of 686743 in words is "six hundred eighty-six thousand, seven hundred forty-three".