685357 has 4 divisors (see below), whose sum is σ = 709020. Its totient is φ = 661696.

The previous prime is 685339. The next prime is 685361. The reversal of 685357 is 753586.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 753586 = 2 ⋅376793.

It can be written as a sum of positive squares in 2 ways, for example, as 509796 + 175561 = 714^2 + 419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685357 is a prime.

It is a Duffinian number.

685357 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685337) 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, 11788 + ... + 11845.

It is an arithmetic number, because the mean of its divisors is an integer number (177255).

2⁶⁸⁵³⁵⁷ is an apocalyptic number.

It is an amenable number.

685357 is a deficient number, since it is larger than the sum of its proper divisors (23663).

685357 is a wasteful number, since it uses less digits than its factorization.

685357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23662.

The product of its digits is 25200, while the sum is 34.

The square root of 685357 is about 827.8629113567. The cubic root of 685357 is about 88.1669094626.

The spelling of 685357 in words is "six hundred eighty-five thousand, three hundred fifty-seven".