689939 has 8 divisors (see below), whose sum is σ = 734160. Its totient is φ = 647136.

The previous prime is 689929. The next prime is 689951. The reversal of 689939 is 939986.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 689939.

It is not an unprimeable number, because it can be changed into a prime (689929) 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, 752 + ... + 1394.

It is an arithmetic number, because the mean of its divisors is an integer number (91770).

2⁶⁸⁹⁹³⁹ is an apocalyptic number.

689939 is a deficient number, since it is larger than the sum of its proper divisors (44221).

689939 is a wasteful number, since it uses less digits than its factorization.

689939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709.

The product of its digits is 104976, while the sum is 44.

The square root of 689939 is about 830.6256677951. The cubic root of 689939 is about 88.3629551381.

Subtracting 689939 from its reverse (939986), we obtain a cube (250047 = 63³).

The spelling of 689939 in words is "six hundred eighty-nine thousand, nine hundred thirty-nine".