685122 has 16 divisors (see below), whose sum is σ = 1386720. Its totient is φ = 225632.

The previous prime is 685109. The next prime is 685123. The reversal of 685122 is 221586.

It is a d-powerful number, because it can be written as 6⁵ + 8⁶ + 1 + 5⁸ + 2¹³ + 2¹⁴ .

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 685092 and 685101.

It is not an unprimeable number, because it can be changed into a prime (685123) by changing a digit.

685122 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108 + ... + 1175.

It is an arithmetic number, because the mean of its divisors is an integer number (86670).

2⁶⁸⁵¹²² is an apocalyptic number.

685122 is an abundant number, since it is smaller than the sum of its proper divisors (701598).

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

685122 is a wasteful number, since it uses less digits than its factorization.

685122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377.

The product of its digits is 960, while the sum is 24.

The square root of 685122 is about 827.7209674764. The cubic root of 685122 is about 88.1568312152.

The spelling of 685122 in words is "six hundred eighty-five thousand, one hundred twenty-two".