686929 has 4 divisors (see below), whose sum is σ = 709120. Its totient is φ = 664740.

The previous prime is 686911. The next prime is 686947. The reversal of 686929 is 929686.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 929686 = 2 ⋅464843.

It is an interprime number because it is at equal distance from previous prime (686911) and next prime (686947).

It is a cyclic number.

It is not a de Polignac number, because 686929 - 2⁵ = 686897 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 686891 and 686900.

It is not an unprimeable number, because it can be changed into a prime (686969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11049 + ... + 11110.

It is an arithmetic number, because the mean of its divisors is an integer number (177280).

2⁶⁸⁶⁹²⁹ is an apocalyptic number.

It is an amenable number.

686929 is a deficient number, since it is larger than the sum of its proper divisors (22191).

686929 is a wasteful number, since it uses less digits than its factorization.

686929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22190.

The product of its digits is 46656, while the sum is 40.

The square root of 686929 is about 828.8118001090. The cubic root of 686929 is about 88.2342673257.

The spelling of 686929 in words is "six hundred eighty-six thousand, nine hundred twenty-nine".