18240032847 has 4 divisors (see below), whose sum is σ = 24320043800. Its totient is φ = 12160021896.

The previous prime is 18240032843. The next prime is 18240032893. The reversal of 18240032847 is 74823004281.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18240032847 - 2² = 18240032843 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 (18240032843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3040005472 + ... + 3040005477.

It is an arithmetic number, because the mean of its divisors is an integer number (6080010950).

Almost surely, 2^18240032847 is an apocalyptic number.

18240032847 is a deficient number, since it is larger than the sum of its proper divisors (6080010953).

18240032847 is an equidigital number, since it uses as much as digits as its factorization.

18240032847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6080010952.

The product of its (nonzero) digits is 86016, while the sum is 39.

The spelling of 18240032847 in words is "eighteen billion, two hundred forty million, thirty-two thousand, eight hundred forty-seven".