12398194851840 has 1664 divisors, whose sum is σ = 55662775326720. Its totient is φ = 2551210573824.

The previous prime is 12398194851829. The next prime is 12398194851841. The reversal of 12398194851840 is 4815849189321.

12398194851840 is a `hidden beast` number, since 1 + 2 + 3 + 98 + 19 + 485 + 18 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12398194851841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 539051950069 + ... + 539051950091.

Almost surely, 2^{12398194851840} is an apocalyptic number.

12398194851840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12398194851840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27831387663360).

12398194851840 is an abundant number, since it is smaller than the sum of its proper divisors (43264580474880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12398194851840 is an frugal number, since it uses more digits than its factorization.

12398194851840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 63.

The spelling of 12398194851840 in words is "twelve trillion, three hundred ninety-eight billion, one hundred ninety-four million, eight hundred fifty-one thousand, eight hundred forty".