686769 has 4 divisors (see below), whose sum is σ = 915696. Its totient is φ = 457844.

The previous prime is 686761. The next prime is 686773. The reversal of 686769 is 967686.

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.

It is a cyclic number.

It is not a de Polignac number, because 686769 - 2³ = 686761 is a prime.

It is a super-2 number, since 2×686769² = 943303318722, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

686769 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 686769.

It is not an unprimeable number, because it can be changed into a prime (686761) 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, 114459 + ... + 114464.

It is an arithmetic number, because the mean of its divisors is an integer number (228924).

2⁶⁸⁶⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

686769 is a deficient number, since it is larger than the sum of its proper divisors (228927).

686769 is a wasteful number, since it uses less digits than its factorization.

686769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228926.

The product of its digits is 108864, while the sum is 42.

The square root of 686769 is about 828.7152707655. The cubic root of 686769 is about 88.2274162640.

The spelling of 686769 in words is "six hundred eighty-six thousand, seven hundred sixty-nine".