609839 has 4 divisors (see below), whose sum is σ = 616224. Its totient is φ = 603456.

The previous prime is 609821. The next prime is 609859. The reversal of 609839 is 938906.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-609839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 609799 and 609808.

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 609839.

It is not an unprimeable number, because it can be changed into a prime (609809) 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, 3047 + ... + 3240.

It is an arithmetic number, because the mean of its divisors is an integer number (154056).

2⁶⁰⁹⁸³⁹ is an apocalyptic number.

609839 is a deficient number, since it is larger than the sum of its proper divisors (6385).

609839 is an equidigital number, since it uses as much as digits as its factorization.

609839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6384.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 609839 is about 780.9218911005. The cubic root of 609839 is about 84.8017988671.

The spelling of 609839 in words is "six hundred nine thousand, eight hundred thirty-nine".