686241 has 6 divisors (see below), whose sum is σ = 991250. Its totient is φ = 457488.

The previous prime is 686209. The next prime is 686267. The reversal of 686241 is 142686.

It can be written as a sum of positive squares in only one way, i.e., 608400 + 77841 = 780^2 + 279^2 .

It is not a de Polignac number, because 686241 - 2⁵ = 686209 is a prime.

It is a Duffinian number.

686241 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (686201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38116 + ... + 38133.

2⁶⁸⁶²⁴¹ is an apocalyptic number.

It is an amenable number.

686241 is a deficient number, since it is larger than the sum of its proper divisors (305009).

686241 is a wasteful number, since it uses less digits than its factorization.

686241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76255 (or 76252 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 686241 is about 828.3966441265. The cubic root of 686241 is about 88.2048002077.

It can be divided in two parts, 6862 and 41, that added together give a triangular number (6903 = T₁₁₇).

The spelling of 686241 in words is "six hundred eighty-six thousand, two hundred forty-one".