686245 has 12 divisors (see below), whose sum is σ = 958284. Its totient is φ = 470400.

The previous prime is 686209. The next prime is 686267. The reversal of 686245 is 542686.

686245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 298116 + 388129 = 546^2 + 623^2 .

It is not a de Polignac number, because 686245 - 2⁷ = 686117 is a prime.

It is a Duffinian number.

686245 is a lucky number.

It is a nialpdrome in base 7.

It is a zygodrome in base 7.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1156 + ... + 1645.

It is an arithmetic number, because the mean of its divisors is an integer number (79857).

2⁶⁸⁶²⁴⁵ is an apocalyptic number.

It is an amenable number.

686245 is a deficient number, since it is larger than the sum of its proper divisors (272039).

686245 is a wasteful number, since it uses less digits than its factorization.

686245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2820 (or 2813 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 686245 is about 828.3990584253. The cubic root of 686245 is about 88.2049715850.

The spelling of 686245 in words is "six hundred eighty-six thousand, two hundred forty-five".