689866 has 16 divisors (see below), whose sum is σ = 1088640. Its totient is φ = 327520.

The previous prime is 689851. The next prime is 689867. The reversal of 689866 is 668986.

It is an Ulam number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (689867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3765 + ... + 3943.

It is an arithmetic number, because the mean of its divisors is an integer number (68040).

2⁶⁸⁹⁸⁶⁶ is an apocalyptic number.

689866 is a deficient number, since it is larger than the sum of its proper divisors (398774).

689866 is a wasteful number, since it uses less digits than its factorization.

689866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269.

The product of its digits is 124416, while the sum is 43.

The square root of 689866 is about 830.5817238538. The cubic root of 689866 is about 88.3598385711.

The spelling of 689866 in words is "six hundred eighty-nine thousand, eight hundred sixty-six".