689844 has 12 divisors (see below), whose sum is σ = 1609664. Its totient is φ = 229944.

The previous prime is 689831. The next prime is 689851. The reversal of 689844 is 448986.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

689844 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28732 + ... + 28755.

2⁶⁸⁹⁸⁴⁴ is an apocalyptic number.

It is an amenable number.

689844 is an abundant number, since it is smaller than the sum of its proper divisors (919820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

689844 is a wasteful number, since it uses less digits than its factorization.

689844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57494 (or 57492 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 689844 is about 830.5684800184. The cubic root of 689844 is about 88.3588992887.

The spelling of 689844 in words is "six hundred eighty-nine thousand, eight hundred forty-four".