686425 has 6 divisors (see below), whose sum is σ = 851198. Its totient is φ = 549120.

The previous prime is 686423. The next prime is 686437. The reversal of 686425 is 524686.

It can be written as a sum of positive squares in 3 ways, for example, as 841 + 685584 = 29^2 + 828^2 .

It is not a de Polignac number, because 686425 - 2¹ = 686423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686423) 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 5 ways as a sum of consecutive naturals, for example, 13704 + ... + 13753.

2⁶⁸⁶⁴²⁵ is an apocalyptic number.

It is an amenable number.

686425 is a deficient number, since it is larger than the sum of its proper divisors (164773).

686425 is a wasteful number, since it uses less digits than its factorization.

686425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27467 (or 27462 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 686425 is about 828.5076945931. The cubic root of 686425 is about 88.2126828771.

It can be divided in two parts, 6864 and 25, that added together give a square (6889 = 83²).

The spelling of 686425 in words is "six hundred eighty-six thousand, four hundred twenty-five".