685396 has 18 divisors (see below), whose sum is σ = 1242542. Its totient is φ = 330720.

The previous prime is 685393. The next prime is 685417. The reversal of 685396 is 693586.

685396 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 3 ways, for example, as 67600 + 617796 = 260^2 + 786^2 .

It is a nialpdrome in base 16.

It is a congruent number.

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 in 5 ways as a sum of consecutive naturals, for example, 11206 + ... + 11266.

2⁶⁸⁵³⁹⁶ is an apocalyptic number.

It is an amenable number.

685396 is a deficient number, since it is larger than the sum of its proper divisors (557146).

685396 is a wasteful number, since it uses less digits than its factorization.

685396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171 (or 116 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The square root of 685396 is about 827.8864656461. The cubic root of 685396 is about 88.1685817999.

It can be divided in two parts, 685 and 396, that added together give a triangular number (1081 = T₄₆).

The spelling of 685396 in words is "six hundred eighty-five thousand, three hundred ninety-six".