685458 has 24 divisors (see below), whose sum is σ = 1502748. Its totient is φ = 225792.

The previous prime is 685453. The next prime is 685459. The reversal of 685458 is 854586.

It is a happy number.

685458 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 558009 + 127449 = 747^2 + 357^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 685458.

It is not an unprimeable number, because it can be changed into a prime (685453) by changing a digit.

685458 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 11 ways as a sum of consecutive naturals, for example, 1866 + ... + 2202.

2⁶⁸⁵⁴⁵⁸ is an apocalyptic number.

685458 is an abundant number, since it is smaller than the sum of its proper divisors (817290).

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

685458 is a wasteful number, since it uses less digits than its factorization.

685458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458 (or 455 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 685458 is about 827.9239095472. The cubic root of 685458 is about 88.1712402568.

The spelling of 685458 in words is "six hundred eighty-five thousand, four hundred fifty-eight".