688943 has 4 divisors (see below), whose sum is σ = 700680. Its totient is φ = 677208.

The previous prime is 688939. The next prime is 688951. The reversal of 688943 is 349886.

688943 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, and also an emirpimes, since its reverse is a distinct semiprime: 349886 = 2 ⋅174943.

It is a cyclic number.

It is not a de Polignac number, because 688943 - 2² = 688939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 688897 and 688906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688543) 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, 5780 + ... + 5897.

It is an arithmetic number, because the mean of its divisors is an integer number (175170).

2⁶⁸⁸⁹⁴³ is an apocalyptic number.

688943 is a deficient number, since it is larger than the sum of its proper divisors (11737).

688943 is a wasteful number, since it uses less digits than its factorization.

688943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11736.

The product of its digits is 41472, while the sum is 38.

The square root of 688943 is about 830.0259032103. The cubic root of 688943 is about 88.3204142334.

The spelling of 688943 in words is "six hundred eighty-eight thousand, nine hundred forty-three".