685143 has 12 divisors (see below), whose sum is σ = 996840. Its totient is φ = 453456.

The previous prime is 685141. The next prime is 685169. The reversal of 685143 is 341586.

It is not a de Polignac number, because 685143 - 2¹ = 685141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685141) 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 11 ways as a sum of consecutive naturals, for example, 2280 + ... + 2562.

It is an arithmetic number, because the mean of its divisors is an integer number (83070).

2⁶⁸⁵¹⁴³ is an apocalyptic number.

685143 is a deficient number, since it is larger than the sum of its proper divisors (311697).

685143 is a wasteful number, since it uses less digits than its factorization.

685143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558 (or 555 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 685143 is about 827.7336528135. The cubic root of 685143 is about 88.1577319183.

It can be divided in two parts, 685 and 143, that added together give a palindrome (828).

The spelling of 685143 in words is "six hundred eighty-five thousand, one hundred forty-three".