18240823 has 8 divisors (see below), whose sum is σ = 18675360. Its totient is φ = 17811360.

The previous prime is 18240793. The next prime is 18240829. The reversal of 18240823 is 32804281.

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

It is a cyclic number.

It is not a de Polignac number, because 18240823 - 2⁵ = 18240791 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18240791 and 18240800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18240829) 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 7 ways as a sum of consecutive naturals, for example, 6561 + ... + 8917.

It is an arithmetic number, because the mean of its divisors is an integer number (2334420).

Almost surely, 2^18240823 is an apocalyptic number.

18240823 is a deficient number, since it is larger than the sum of its proper divisors (434537).

18240823 is a wasteful number, since it uses less digits than its factorization.

18240823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2537.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 18240823 is about 4270.9276509911. The cubic root of 18240823 is about 263.2377336400.

The spelling of 18240823 in words is "eighteen million, two hundred forty thousand, eight hundred twenty-three".