686338 has 4 divisors (see below), whose sum is σ = 1029510. Its totient is φ = 343168.

The previous prime is 686333. The next prime is 686339. The reversal of 686338 is 833686.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 471969 + 214369 = 687^2 + 463^2 .

It is not an unprimeable number, because it can be changed into a prime (686333) by changing a digit.

686338 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171583 + ... + 171586.

2⁶⁸⁶³³⁸ is an apocalyptic number.

686338 is a deficient number, since it is larger than the sum of its proper divisors (343172).

686338 is a wasteful number, since it uses less digits than its factorization.

686338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343171.

The product of its digits is 20736, while the sum is 34.

The square root of 686338 is about 828.4551888907. The cubic root of 686338 is about 88.2089559210.

It can be divided in two parts, 686 and 338, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 686338 in words is "six hundred eighty-six thousand, three hundred thirty-eight".