687143 has 4 divisors (see below), whose sum is σ = 689520. Its totient is φ = 684768.

The previous prime is 687139. The next prime is 687151. The reversal of 687143 is 341786.

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 687143 - 2² = 687139 is a prime.

It is a super-3 number, since 3×687143³ = 973335659547939621, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 683 + ... + 1356.

It is an arithmetic number, because the mean of its divisors is an integer number (172380).

2⁶⁸⁷¹⁴³ is an apocalyptic number.

687143 is a deficient number, since it is larger than the sum of its proper divisors (2377).

687143 is a wasteful number, since it uses less digits than its factorization.

687143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2376.

The product of its digits is 4032, while the sum is 29.

The square root of 687143 is about 828.9408905344. The cubic root of 687143 is about 88.2434289580.

The spelling of 687143 in words is "six hundred eighty-seven thousand, one hundred forty-three".