686039 has 2 divisors, whose sum is σ = 686040. Its totient is φ = 686038.

The previous prime is 686029. The next prime is 686041. The reversal of 686039 is 930686.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686039 - 2¹² = 681943 is a prime.

It is a Sophie Germain prime.

Together with 686041, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 685996 and 686014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (686009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343019 + 343020.

It is an arithmetic number, because the mean of its divisors is an integer number (343020).

2⁶⁸⁶⁰³⁹ is an apocalyptic number.

686039 is a deficient number, since it is larger than the sum of its proper divisors (1).

686039 is an equidigital number, since it uses as much as digits as its factorization.

686039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 686039 is about 828.2747128821. The cubic root of 686039 is about 88.1961447848.

The spelling of 686039 in words is "six hundred eighty-six thousand, thirty-nine".