2291823 has 6 divisors (see below), whose sum is σ = 3310424. Its totient is φ = 1527876.

The previous prime is 2291803. The next prime is 2291827. The reversal of 2291823 is 3281922.

It is a happy number.

It is not a de Polignac number, because 2291823 - 2⁸ = 2291567 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 (2291827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 127315 + ... + 127332.

2^2291823 is an apocalyptic number.

2291823 is a deficient number, since it is larger than the sum of its proper divisors (1018601).

2291823 is a wasteful number, since it uses less digits than its factorization.

2291823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254653 (or 254650 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 2291823 is about 1513.8768113687. The cubic root of 2291823 is about 131.8439961406.

Subtracting 2291823 from its reverse (3281922), we obtain a palindrome (990099).

The spelling of 2291823 in words is "two million, two hundred ninety-one thousand, eight hundred twenty-three".