2009823 has 8 divisors (see below), whose sum is σ = 2766336. Its totient is φ = 1296600.

The previous prime is 2009807. The next prime is 2009827. The reversal of 2009823 is 3289002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2009823 - 2⁴ = 2009807 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2009793 and 2009802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2009827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10713 + ... + 10898.

It is an arithmetic number, because the mean of its divisors is an integer number (345792).

2^2009823 is an apocalyptic number.

2009823 is a deficient number, since it is larger than the sum of its proper divisors (756513).

2009823 is a wasteful number, since it uses less digits than its factorization.

2009823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21645.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 2009823 is about 1417.6822634145. The cubic root of 2009823 is about 126.1980382840.

The spelling of 2009823 in words is "two million, nine thousand, eight hundred twenty-three".