689744 has 20 divisors (see below), whose sum is σ = 1458240. Its totient is φ = 313440.

The previous prime is 689723. The next prime is 689761. The reversal of 689744 is 447986.

It is a happy number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 689698 and 689707.

It is a congruent number.

It is an unprimeable number.

689744 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1784 + ... + 2135.

It is an arithmetic number, because the mean of its divisors is an integer number (72912).

2⁶⁸⁹⁷⁴⁴ is an apocalyptic number.

It is an amenable number.

689744 is an abundant number, since it is smaller than the sum of its proper divisors (768496).

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

689744 is a wasteful number, since it uses less digits than its factorization.

689744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3938 (or 3932 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 689744 is about 830.5082781044. The cubic root of 689744 is about 88.3546295712.

The spelling of 689744 in words is "six hundred eighty-nine thousand, seven hundred forty-four".