686450 has 12 divisors (see below), whose sum is σ = 1276890. Its totient is φ = 274560.

The previous prime is 686449. The next prime is 686453. The reversal of 686450 is 54686.

It can be written as a sum of positive squares in 3 ways, for example, as 466489 + 219961 = 683^2 + 469^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686453) 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, 6815 + ... + 6914.

2⁶⁸⁶⁴⁵⁰ is an apocalyptic number.

686450 is a deficient number, since it is larger than the sum of its proper divisors (590440).

686450 is a wasteful number, since it uses less digits than its factorization.

686450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13741 (or 13736 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 686450 is about 828.5227818232. The cubic root of 686450 is about 88.2137537833.

The spelling of 686450 in words is "six hundred eighty-six thousand, four hundred fifty".