18084207971 has 4 divisors (see below), whose sum is σ = 18100227000. Its totient is φ = 18068188944.

The previous prime is 18084207919. The next prime is 18084207989. The reversal of 18084207971 is 17970248081.

It is a happy number.

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-18084207971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18084207671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8007821 + ... + 8010078.

It is an arithmetic number, because the mean of its divisors is an integer number (4525056750).

Almost surely, 2^18084207971 is an apocalyptic number.

18084207971 is a deficient number, since it is larger than the sum of its proper divisors (16019029).

18084207971 is a wasteful number, since it uses less digits than its factorization.

18084207971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16019028.

The product of its (nonzero) digits is 225792, while the sum is 47.

The spelling of 18084207971 in words is "eighteen billion, eighty-four million, two hundred seven thousand, nine hundred seventy-one".