686899 has 4 divisors (see below), whose sum is σ = 691600. Its totient is φ = 682200.

The previous prime is 686897. The next prime is 686911. The reversal of 686899 is 998686.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 686899 - 2¹ = 686897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686891) 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, 2124 + ... + 2425.

It is an arithmetic number, because the mean of its divisors is an integer number (172900).

2⁶⁸⁶⁸⁹⁹ is an apocalyptic number.

686899 is a deficient number, since it is larger than the sum of its proper divisors (4701).

686899 is a wasteful number, since it uses less digits than its factorization.

686899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4700.

The product of its digits is 186624, while the sum is 46.

The square root of 686899 is about 828.7937017135. The cubic root of 686899 is about 88.2329828327.

The spelling of 686899 in words is "six hundred eighty-six thousand, eight hundred ninety-nine".