686393 has 4 divisors (see below), whose sum is σ = 690768. Its totient is φ = 682020.

The previous prime is 686363. The next prime is 686417. The reversal of 686393 is 393686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 686393 - 2¹⁰ = 685369 is a prime.

It is a super-2 number, since 2×686393² = 942270700898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686333) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1943 + ... + 2268.

It is an arithmetic number, because the mean of its divisors is an integer number (172692).

2⁶⁸⁶³⁹³ is an apocalyptic number.

It is an amenable number.

686393 is a deficient number, since it is larger than the sum of its proper divisors (4375).

686393 is a wasteful number, since it uses less digits than its factorization.

686393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4374.

The product of its digits is 23328, while the sum is 35.

The square root of 686393 is about 828.4883825377. The cubic root of 686393 is about 88.2113120793.

The spelling of 686393 in words is "six hundred eighty-six thousand, three hundred ninety-three".