687841 has 8 divisors (see below), whose sum is σ = 857664. Its totient is φ = 535920.

The previous prime is 687839. The next prime is 687847. The reversal of 687841 is 148786.

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 687841 - 2¹ = 687839 is a prime.

It is a Duffinian number.

687841 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 687797 and 687806.

It is not an unprimeable number, because it can be changed into a prime (687847) 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, 4390 + ... + 4543.

It is an arithmetic number, because the mean of its divisors is an integer number (107208).

2⁶⁸⁷⁸⁴¹ is an apocalyptic number.

It is an amenable number.

687841 is a deficient number, since it is larger than the sum of its proper divisors (169823).

687841 is a wasteful number, since it uses less digits than its factorization.

687841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8951.

The product of its digits is 10752, while the sum is 34.

The square root of 687841 is about 829.3618028340. The cubic root of 687841 is about 88.2732980777.

The spelling of 687841 in words is "six hundred eighty-seven thousand, eight hundred forty-one".