689966 has 16 divisors (see below), whose sum is σ = 1109760. Its totient is φ = 320760.

The previous prime is 689963. The next prime is 689981. The reversal of 689966 is 669986.

689966 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 689966.

It is not an unprimeable number, because it can be changed into a prime (689963) 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, 2411 + ... + 2681.

It is an arithmetic number, because the mean of its divisors is an integer number (69360).

2⁶⁸⁹⁹⁶⁶ is an apocalyptic number.

689966 is a deficient number, since it is larger than the sum of its proper divisors (419794).

689966 is a wasteful number, since it uses less digits than its factorization.

689966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359.

The product of its digits is 139968, while the sum is 44.

The square root of 689966 is about 830.6419204447. The cubic root of 689966 is about 88.3641077852.

The spelling of 689966 in words is "six hundred eighty-nine thousand, nine hundred sixty-six".