12638140398 has 48 divisors (see below), whose sum is σ = 30252252240. Its totient is φ = 3887742096.

The previous prime is 12638140343. The next prime is 12638140399. The reversal of 12638140398 is 89304183621.

12638140398 is a `hidden beast` number, since 1 + 2 + 638 + 1 + 4 + 0 + 3 + 9 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12638140399) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2976465 + ... + 2980707.

It is an arithmetic number, because the mean of its divisors is an integer number (630255255).

Almost surely, 2^12638140398 is an apocalyptic number.

12638140398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12638140398 is an abundant number, since it is smaller than the sum of its proper divisors (17614111842).

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

12638140398 is an frugal number, since it uses more digits than its factorization.

12638140398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8510 (or 4261 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 12638140398 in words is "twelve billion, six hundred thirty-eight million, one hundred forty thousand, three hundred ninety-eight".