685798 has 4 divisors (see below), whose sum is σ = 1028700. Its totient is φ = 342898.

The previous prime is 685793. The next prime is 685819. The reversal of 685798 is 897586.

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: 897586 = 2 ⋅448793.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171448 + ... + 171451.

It is an arithmetic number, because the mean of its divisors is an integer number (257175).

2⁶⁸⁵⁷⁹⁸ is an apocalyptic number.

685798 is a deficient number, since it is larger than the sum of its proper divisors (342902).

685798 is a wasteful number, since it uses less digits than its factorization.

685798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342901.

The product of its digits is 120960, while the sum is 43.

The square root of 685798 is about 828.1292169704. The cubic root of 685798 is about 88.1858160424.

The spelling of 685798 in words is "six hundred eighty-five thousand, seven hundred ninety-eight".