689863 has 4 divisors (see below), whose sum is σ = 691560. Its totient is φ = 688168.

The previous prime is 689851. The next prime is 689867. The reversal of 689863 is 368986.

689863 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 a cyclic number.

It is not a de Polignac number, because 689863 - 2⁵ = 689831 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689867) 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, 168 + ... + 1186.

It is an arithmetic number, because the mean of its divisors is an integer number (172890).

2⁶⁸⁹⁸⁶³ is an apocalyptic number.

689863 is a deficient number, since it is larger than the sum of its proper divisors (1697).

689863 is a wasteful number, since it uses less digits than its factorization.

689863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696.

The product of its digits is 62208, while the sum is 40.

The square root of 689863 is about 830.5799178887. The cubic root of 689863 is about 88.3597104883.

The spelling of 689863 in words is "six hundred eighty-nine thousand, eight hundred sixty-three".