685938 has 32 divisors (see below), whose sum is σ = 1578240. Its totient is φ = 196560.

The previous prime is 685907. The next prime is 685939. The reversal of 685938 is 839586.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 685896 and 685905.

It is not an unprimeable number, because it can be changed into a prime (685939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 981 + ... + 1527.

It is an arithmetic number, because the mean of its divisors is an integer number (49320).

2⁶⁸⁵⁹³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (789120).

685938 is an abundant number, since it is smaller than the sum of its proper divisors (892302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685938 is a wasteful number, since it uses less digits than its factorization.

685938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582.

The product of its digits is 51840, while the sum is 39.

The square root of 685938 is about 828.2137405284. The cubic root of 685938 is about 88.1918164362.

It can be divided in two parts, 68 and 5938, that added together give a palindrome (6006).

The spelling of 685938 in words is "six hundred eighty-five thousand, nine hundred thirty-eight".