685887 has 8 divisors (see below), whose sum is σ = 924336. Its totient is φ = 452352.

The previous prime is 685859. The next prime is 685907. The reversal of 685887 is 788586.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 685887 - 2⁷ = 685759 is a prime.

685887 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 888 + ... + 1469.

It is an arithmetic number, because the mean of its divisors is an integer number (115542).

2⁶⁸⁵⁸⁸⁷ is an apocalyptic number.

685887 is a deficient number, since it is larger than the sum of its proper divisors (238449).

685887 is a wasteful number, since it uses less digits than its factorization.

685887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2457.

The product of its digits is 107520, while the sum is 42.

The square root of 685887 is about 828.1829508025. The cubic root of 685887 is about 88.1896306730.

The spelling of 685887 in words is "six hundred eighty-five thousand, eight hundred eighty-seven".