689943 has 4 divisors (see below), whose sum is σ = 919928. Its totient is φ = 459960.

The previous prime is 689929. The next prime is 689951. The reversal of 689943 is 349986.

689943 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 689943 - 2⁶ = 689879 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 15.

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 689943.

It is not an unprimeable number, because it can be changed into a prime (689903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114988 + ... + 114993.

It is an arithmetic number, because the mean of its divisors is an integer number (229982).

2⁶⁸⁹⁹⁴³ is an apocalyptic number.

689943 is a deficient number, since it is larger than the sum of its proper divisors (229985).

689943 is a wasteful number, since it uses less digits than its factorization.

689943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229984.

The product of its digits is 46656, while the sum is 39.

The square root of 689943 is about 830.6280756151. The cubic root of 689943 is about 88.3631259025.

It can be divided in two parts, 68 and 9943, that added together give a triangular number (10011 = T₁₄₁).

The spelling of 689943 in words is "six hundred eighty-nine thousand, nine hundred forty-three".