686912 has 14 divisors (see below), whose sum is σ = 1363218. Its totient is φ = 343424.

The previous prime is 686911. The next prime is 686947. The reversal of 686912 is 219686.

It can be written as a sum of positive squares in only one way, i.e., 440896 + 246016 = 664^2 + 496^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303 + ... + 5430.

2⁶⁸⁶⁹¹² is an apocalyptic number.

It is an amenable number.

686912 is a deficient number, since it is larger than the sum of its proper divisors (676306).

686912 is a wasteful number, since it uses less digits than its factorization.

686912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10745 (or 10735 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 686912 is about 828.8015444001. The cubic root of 686912 is about 88.2335394509.

It can be divided in two parts, 6869 and 12, that multiplied together give a palindrome (82428).

The spelling of 686912 in words is "six hundred eighty-six thousand, nine hundred twelve".