685595 has 4 divisors (see below), whose sum is σ = 822720. Its totient is φ = 548472.

The previous prime is 685591. The next prime is 685609. The reversal of 685595 is 595586.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 595586 = 2 ⋅297793.

It is a cyclic number.

It is not a de Polignac number, because 685595 - 2² = 685591 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685591) 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, 68555 + ... + 68564.

It is an arithmetic number, because the mean of its divisors is an integer number (205680).

2⁶⁸⁵⁵⁹⁵ is an apocalyptic number.

685595 is a deficient number, since it is larger than the sum of its proper divisors (137125).

685595 is a wasteful number, since it uses less digits than its factorization.

685595 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137124.

The product of its digits is 54000, while the sum is 38.

The square root of 685595 is about 828.0066424854. The cubic root of 685595 is about 88.1771140207.

Subtracting from 685595 its reverse (595586), we obtain a palindrome (90009).

The spelling of 685595 in words is "six hundred eighty-five thousand, five hundred ninety-five".