686486 has 4 divisors (see below), whose sum is σ = 1029732. Its totient is φ = 343242.

The previous prime is 686479. The next prime is 686503. The reversal of 686486 is 684686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 684686 = 2 ⋅342343.

It is a congruent number.

It is an unprimeable number.

686486 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 171620 + ... + 171623.

It is an arithmetic number, because the mean of its divisors is an integer number (257433).

2⁶⁸⁶⁴⁸⁶ is an apocalyptic number.

686486 is a deficient number, since it is larger than the sum of its proper divisors (343246).

686486 is a wasteful number, since it uses less digits than its factorization.

686486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343245.

The product of its digits is 55296, while the sum is 38.

The square root of 686486 is about 828.5445069518. The cubic root of 686486 is about 88.2152958425.

The spelling of 686486 in words is "six hundred eighty-six thousand, four hundred eighty-six".