686495 has 16 divisors (see below), whose sum is σ = 878592. Its totient is φ = 514080.

The previous prime is 686479. The next prime is 686503. The reversal of 686495 is 594686.

It is not a de Polignac number, because 686495 - 2⁴ = 686479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 686495.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6614 + ... + 6716.

It is an arithmetic number, because the mean of its divisors is an integer number (54912).

2⁶⁸⁶⁴⁹⁵ is an apocalyptic number.

686495 is a deficient number, since it is larger than the sum of its proper divisors (192097).

686495 is a wasteful number, since it uses less digits than its factorization.

686495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182.

The product of its digits is 51840, while the sum is 38.

The square root of 686495 is about 828.5499381449. The cubic root of 686495 is about 88.2156813489.

Subtracting from 686495 its reverse (594686), we obtain a square (91809 = 303²).

The spelling of 686495 in words is "six hundred eighty-six thousand, four hundred ninety-five".