609879 has 4 divisors (see below), whose sum is σ = 813176. Its totient is φ = 406584.

The previous prime is 609877. The next prime is 609887. The reversal of 609879 is 978906.

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

It is not a de Polignac number, because 609879 - 2¹ = 609877 is a prime.

It is a D-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 (609877) 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, 101644 + ... + 101649.

It is an arithmetic number, because the mean of its divisors is an integer number (203294).

2⁶⁰⁹⁸⁷⁹ is an apocalyptic number.

609879 is a deficient number, since it is larger than the sum of its proper divisors (203297).

609879 is a wasteful number, since it uses less digits than its factorization.

609879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203296.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 609879 is about 780.9475014366. The cubic root of 609879 is about 84.8036529072.

The spelling of 609879 in words is "six hundred nine thousand, eight hundred seventy-nine".