685424 has 10 divisors (see below), whose sum is σ = 1328040. Its totient is φ = 342704.

The previous prime is 685417. The next prime is 685427. The reversal of 685424 is 424586.

685424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685427) by changing a digit.

685424 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 as a sum of consecutive naturals, namely, 21404 + ... + 21435.

It is an arithmetic number, because the mean of its divisors is an integer number (132804).

2⁶⁸⁵⁴²⁴ is an apocalyptic number.

It is an amenable number.

685424 is a deficient number, since it is larger than the sum of its proper divisors (642616).

685424 is a wasteful number, since it uses less digits than its factorization.

685424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42847 (or 42841 counting only the distinct ones).

The product of its digits is 7680, while the sum is 29.

The square root of 685424 is about 827.9033760047. The cubic root of 685424 is about 88.1697824132.

The spelling of 685424 in words is "six hundred eighty-five thousand, four hundred twenty-four".