2011823 has 4 divisors (see below), whose sum is σ = 2194728. Its totient is φ = 1828920.

The previous prime is 2011811. The next prime is 2011843. The reversal of 2011823 is 3281102.

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-2011823 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 (2011843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91436 + ... + 91457.

It is an arithmetic number, because the mean of its divisors is an integer number (548682).

2^2011823 is an apocalyptic number.

2011823 is a deficient number, since it is larger than the sum of its proper divisors (182905).

2011823 is a wasteful number, since it uses less digits than its factorization.

2011823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182904.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 2011823 is about 1418.3874646936. The cubic root of 2011823 is about 126.2398848217.

Adding to 2011823 its reverse (3281102), we get a palindrome (5292925).

The spelling of 2011823 in words is "two million, eleven thousand, eight hundred twenty-three".