685269 has 12 divisors (see below), whose sum is σ = 1066156. Its totient is φ = 421632.

The previous prime is 685249. The next prime is 685271. The reversal of 685269 is 962586.

It can be written as a sum of positive squares in 2 ways, for example, as 396900 + 288369 = 630^2 + 537^2 .

It is not a de Polignac number, because 685269 - 2⁷ = 685141 is a prime.

It is a super-2 number, since 2×685269² = 939187204722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2812 + ... + 3045.

2⁶⁸⁵²⁶⁹ is an apocalyptic number.

It is an amenable number.

685269 is a deficient number, since it is larger than the sum of its proper divisors (380887).

685269 is a wasteful number, since it uses less digits than its factorization.

685269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5876 (or 5873 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 685269 is about 827.8097607542. The cubic root of 685269 is about 88.1631357504.

The spelling of 685269 in words is "six hundred eighty-five thousand, two hundred sixty-nine".