686069 has 4 divisors (see below), whose sum is σ = 726444. Its totient is φ = 645696.

The previous prime is 686057. The next prime is 686087. The reversal of 686069 is 960686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 960686 = 2 ⋅480343.

It can be written as a sum of positive squares in 2 ways, for example, as 237169 + 448900 = 487^2 + 670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686069 is a prime.

It is a super-2 number, since 2×686069² = 941381345522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 686069.

It is not an unprimeable number, because it can be changed into a prime (686009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20162 + ... + 20195.

It is an arithmetic number, because the mean of its divisors is an integer number (181611).

2⁶⁸⁶⁰⁶⁹ is an apocalyptic number.

It is an amenable number.

686069 is a deficient number, since it is larger than the sum of its proper divisors (40375).

686069 is a wasteful number, since it uses less digits than its factorization.

686069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40374.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 686069 is about 828.2928226177. The cubic root of 686069 is about 88.1974303511.

The spelling of 686069 in words is "six hundred eighty-six thousand, sixty-nine".