12398447817 has 56 divisors (see below), whose sum is σ = 21272892864. Its totient is φ = 7075452384.

The previous prime is 12398447779. The next prime is 12398447821. The reversal of 12398447817 is 71874489321.

It is not a de Polignac number, because 12398447817 - 2¹⁰ = 12398446793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12398447417) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 6188938 + ... + 6190940.

Almost surely, 2^12398447817 is an apocalyptic number.

It is an amenable number.

12398447817 is a deficient number, since it is larger than the sum of its proper divisors (8874445047).

12398447817 is an equidigital number, since it uses as much as digits as its factorization.

12398447817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3241 (or 3226 counting only the distinct ones).

The product of its digits is 2709504, while the sum is 54.

The spelling of 12398447817 in words is "twelve billion, three hundred ninety-eight million, four hundred forty-seven thousand, eight hundred seventeen".