686079 has 6 divisors (see below), whose sum is σ = 991016. Its totient is φ = 457380.

The previous prime is 686057. The next prime is 686087. The reversal of 686079 is 970686.

It is not a de Polignac number, because 686079 - 2¹² = 681983 is a prime.

It is a Duffinian number.

686079 is a lucky number.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 38107 + ... + 38124.

2⁶⁸⁶⁰⁷⁹ is an apocalyptic number.

686079 is a deficient number, since it is larger than the sum of its proper divisors (304937).

686079 is a wasteful number, since it uses less digits than its factorization.

686079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76237 (or 76234 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 686079 is about 828.2988591082. The cubic root of 686079 is about 88.1978588648.

The spelling of 686079 in words is "six hundred eighty-six thousand, seventy-nine".