687343 has 2 divisors, whose sum is σ = 687344. Its totient is φ = 687342.

The previous prime is 687341. The next prime is 687359. The reversal of 687343 is 343786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687343 - 2¹ = 687341 is a prime.

Together with 687341, it forms a pair of twin primes.

687343 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343671 + 343672.

It is an arithmetic number, because the mean of its divisors is an integer number (343672).

2⁶⁸⁷³⁴³ is an apocalyptic number.

687343 is a deficient number, since it is larger than the sum of its proper divisors (1).

687343 is an equidigital number, since it uses as much as digits as its factorization.

687343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 31.

The square root of 687343 is about 829.0615176210. The cubic root of 687343 is about 88.2519895118.

It can be divided in two parts, 687 and 343, that multiplied together give a triangular number (235641 = T₆₈₆).

The spelling of 687343 in words is "six hundred eighty-seven thousand, three hundred forty-three".