659839 has 4 divisors (see below), whose sum is σ = 661960. Its totient is φ = 657720.

The previous prime is 659831. The next prime is 659843. The reversal of 659839 is 938956.

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 659839 - 2³ = 659831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (659831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492 + ... + 1249.

It is an arithmetic number, because the mean of its divisors is an integer number (165490).

2⁶⁵⁹⁸³⁹ is an apocalyptic number.

659839 is a deficient number, since it is larger than the sum of its proper divisors (2121).

659839 is a wasteful number, since it uses less digits than its factorization.

659839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120.

The product of its digits is 58320, while the sum is 40.

The square root of 659839 is about 812.3047457697. The cubic root of 659839 is about 87.0587967369.

The spelling of 659839 in words is "six hundred fifty-nine thousand, eight hundred thirty-nine".