686242 has 8 divisors (see below), whose sum is σ = 1083600. Its totient is φ = 325044.

The previous prime is 686209. The next prime is 686267. The reversal of 686242 is 242686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 686242.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8992 + ... + 9067.

It is an arithmetic number, because the mean of its divisors is an integer number (135450).

2⁶⁸⁶²⁴² is an apocalyptic number.

686242 is a deficient number, since it is larger than the sum of its proper divisors (397358).

686242 is a wasteful number, since it uses less digits than its factorization.

686242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18080.

The product of its digits is 4608, while the sum is 28.

The square root of 686242 is about 828.3972477018. The cubic root of 686242 is about 88.2048430521.

Subtracting from 686242 its reverse (242686), we obtain a square (443556 = 666²).

The spelling of 686242 in words is "six hundred eighty-six thousand, two hundred forty-two".