12005547947 has 4 divisors (see below), whose sum is σ = 12043420656. Its totient is φ = 11967675240.

The previous prime is 12005547943. The next prime is 12005547959. The reversal of 12005547947 is 74974550021.

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 12005547947 - 2² = 12005547943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12005547898 and 12005547907.

It is not an unprimeable number, because it can be changed into a prime (12005547943) 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, 18935879 + ... + 18936512.

It is an arithmetic number, because the mean of its divisors is an integer number (3010855164).

Almost surely, 2^12005547947 is an apocalyptic number.

12005547947 is a deficient number, since it is larger than the sum of its proper divisors (37872709).

12005547947 is an equidigital number, since it uses as much as digits as its factorization.

12005547947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37872708.

The product of its (nonzero) digits is 352800, while the sum is 44.

The spelling of 12005547947 in words is "twelve billion, five million, five hundred forty-seven thousand, nine hundred forty-seven".