12398197257 has 64 divisors (see below), whose sum is σ = 20503756800. Its totient is φ = 7367742720.

The previous prime is 12398197249. The next prime is 12398197271. The reversal of 12398197257 is 75279189321.

It is a happy number.

12398197257 is a `hidden beast` number, since 12 + 398 + 197 + 2 + 57 = 666.

It is not a de Polignac number, because 12398197257 - 2³ = 12398197249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12398197297) 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 63 ways as a sum of consecutive naturals, for example, 659494 + ... + 678032.

It is an arithmetic number, because the mean of its divisors is an integer number (320371200).

Almost surely, 2^12398197257 is an apocalyptic number.

12398197257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

12398197257 is a deficient number, since it is larger than the sum of its proper divisors (8105559543).

12398197257 is a wasteful number, since it uses less digits than its factorization.

12398197257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18643 (or 18637 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The spelling of 12398197257 in words is "twelve billion, three hundred ninety-eight million, one hundred ninety-seven thousand, two hundred fifty-seven".