686408 has 16 divisors (see below), whose sum is σ = 1296000. Its totient is φ = 340816.

The previous prime is 686363. The next prime is 686417. The reversal of 686408 is 804686.

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, 1733 + ... + 2091.

It is an arithmetic number, because the mean of its divisors is an integer number (81000).

2⁶⁸⁶⁴⁰⁸ is an apocalyptic number.

It is an amenable number.

686408 is a deficient number, since it is larger than the sum of its proper divisors (609592).

686408 is a wasteful number, since it uses less digits than its factorization.

686408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604 (or 600 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 686408 is about 828.4974351197. The cubic root of 686408 is about 88.2119546461.

The spelling of 686408 in words is "six hundred eighty-six thousand, four hundred eight".