1816823243 has 4 divisors (see below), whose sum is σ = 1817841720. Its totient is φ = 1815804768.

The previous prime is 1816823221. The next prime is 1816823287. The reversal of 1816823243 is 3423286181.

It is a happy number.

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 1816823243 - 2¹⁰ = 1816822219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1816823197 and 1816823206.

It is not an unprimeable number, because it can be changed into a prime (1816823443) 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, 506558 + ... + 510131.

It is an arithmetic number, because the mean of its divisors is an integer number (454460430).

Almost surely, 2^1816823243 is an apocalyptic number.

1816823243 is a deficient number, since it is larger than the sum of its proper divisors (1018477).

1816823243 is a wasteful number, since it uses less digits than its factorization.

1816823243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018476.

The product of its digits is 55296, while the sum is 38.

The square root of 1816823243 is about 42624.2095879795. The cubic root of 1816823243 is about 1220.2183706127.

The spelling of 1816823243 in words is "one billion, eight hundred sixteen million, eight hundred twenty-three thousand, two hundred forty-three".