12117847 has 14 divisors (see below), whose sum is σ = 14274728. Its totient is φ = 10285884.

The previous prime is 12117841. The next prime is 12117851. The reversal of 12117847 is 74871121.

It is a de Polignac number, because none of the positive numbers 2^k-12117847 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 (12117841) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 117598 + ... + 117700.

Almost surely, 2^12117847 is an apocalyptic number.

12117847 is a deficient number, since it is larger than the sum of its proper divisors (2156881).

12117847 is an frugal number, since it uses more digits than its factorization.

12117847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 110 counting only the distinct ones).

The product of its digits is 3136, while the sum is 31.

The square root of 12117847 is about 3481.0698068266. The cubic root of 12117847 is about 229.6898592350.

Adding to 12117847 its reverse (74871121), we get a palindrome (86988968).

The spelling of 12117847 in words is "twelve million, one hundred seventeen thousand, eight hundred forty-seven".