609823 has 4 divisors (see below), whose sum is σ = 612360. Its totient is φ = 607288.

The previous prime is 609821. The next prime is 609859. The reversal of 609823 is 328906.

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 609823 - 2¹ = 609821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 609791 and 609800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (609821) 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, 865 + ... + 1402.

It is an arithmetic number, because the mean of its divisors is an integer number (153090).

2⁶⁰⁹⁸²³ is an apocalyptic number.

609823 is a deficient number, since it is larger than the sum of its proper divisors (2537).

609823 is a wasteful number, since it uses less digits than its factorization.

609823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2536.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 609823 is about 780.9116467309. The cubic root of 609823 is about 84.8010572284.

The spelling of 609823 in words is "six hundred nine thousand, eight hundred twenty-three".