686122 has 4 divisors (see below), whose sum is σ = 1029186. Its totient is φ = 343060.

The previous prime is 686117. The next prime is 686131. The reversal of 686122 is 221686.

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., 641601 + 44521 = 801^2 + 211^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171529 + ... + 171532.

2⁶⁸⁶¹²² is an apocalyptic number.

686122 is a deficient number, since it is larger than the sum of its proper divisors (343064).

686122 is a wasteful number, since it uses less digits than its factorization.

686122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343063.

The product of its digits is 1152, while the sum is 25.

The square root of 686122 is about 828.3248155162. The cubic root of 686122 is about 88.1997014265.

It can be divided in two parts, 686 and 122, that added together give a palindrome (808).

The spelling of 686122 in words is "six hundred eighty-six thousand, one hundred twenty-two".