686395 has 4 divisors (see below), whose sum is σ = 823680. Its totient is φ = 549112.

The previous prime is 686363. The next prime is 686417. The reversal of 686395 is 593686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 593686 = 2 ⋅296843.

It is a cyclic number.

It is not a de Polignac number, because 686395 - 2⁵ = 686363 is a prime.

It is a super-2 number, since 2×686395² = 942276192050, which contains 22 as substring.

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, 68635 + ... + 68644.

It is an arithmetic number, because the mean of its divisors is an integer number (205920).

2⁶⁸⁶³⁹⁵ is an apocalyptic number.

686395 is a deficient number, since it is larger than the sum of its proper divisors (137285).

686395 is a wasteful number, since it uses less digits than its factorization.

686395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137284.

The product of its digits is 38880, while the sum is 37.

The square root of 686395 is about 828.4895895544. The cubic root of 686395 is about 88.2113977554.

It can be divided in two parts, 68639 and 5, that added together give a square (68644 = 262²).

The spelling of 686395 in words is "six hundred eighty-six thousand, three hundred ninety-five".