685394 has 4 divisors (see below), whose sum is σ = 1028094. Its totient is φ = 342696.

The previous prime is 685393. The next prime is 685417. The reversal of 685394 is 493586.

685394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 493586 = 2 ⋅246793.

It can be written as a sum of positive squares in only one way, i.e., 616225 + 69169 = 785^2 + 263^2 .

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (685393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171347 + ... + 171350.

2⁶⁸⁵³⁹⁴ is an apocalyptic number.

685394 is a deficient number, since it is larger than the sum of its proper divisors (342700).

685394 is a wasteful number, since it uses less digits than its factorization.

685394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342699.

The product of its digits is 25920, while the sum is 35.

The square root of 685394 is about 827.8852577501. The cubic root of 685394 is about 88.1684960406.

The spelling of 685394 in words is "six hundred eighty-five thousand, three hundred ninety-four".