687142 has 8 divisors (see below), whose sum is σ = 1044000. Its totient is φ = 339144.

The previous prime is 687139. The next prime is 687151. The reversal of 687142 is 241786.

687142 is nontrivially palindromic in base 9.

687142 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-3 number, since 3×687142³ = 973331410064601864, which contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 687142.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2017 + ... + 2332.

It is an arithmetic number, because the mean of its divisors is an integer number (130500).

2⁶⁸⁷¹⁴² is an apocalyptic number.

687142 is a deficient number, since it is larger than the sum of its proper divisors (356858).

687142 is a wasteful number, since it uses less digits than its factorization.

687142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4430.

The product of its digits is 2688, while the sum is 28.

The square root of 687142 is about 828.9402873549. The cubic root of 687142 is about 88.2433861511.

The spelling of 687142 in words is "six hundred eighty-seven thousand, one hundred forty-two".