18400074947 has 4 divisors (see below), whose sum is σ = 19034560320. Its totient is φ = 17765589576.

The previous prime is 18400074937. The next prime is 18400074977. The reversal of 18400074947 is 74947000481.

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 18400074947 - 2⁸ = 18400074691 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18400074898 and 18400074907.

It is not an unprimeable number, because it can be changed into a prime (18400074907) 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, 317242643 + ... + 317242700.

It is an arithmetic number, because the mean of its divisors is an integer number (4758640080).

Almost surely, 2^18400074947 is an apocalyptic number.

18400074947 is a deficient number, since it is larger than the sum of its proper divisors (634485373).

18400074947 is an equidigital number, since it uses as much as digits as its factorization.

18400074947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634485372.

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 18400074947 in words is "eighteen billion, four hundred million, seventy-four thousand, nine hundred forty-seven".