19898627991390 has 96 divisors (see below), whose sum is σ = 54427574354400. Its totient is φ = 5036488853760.

The previous prime is 19898627991379. The next prime is 19898627991397. The reversal of 19898627991390 is 9319972689891.

19898627991390 is a `hidden beast` number, since 1 + 9 + 89 + 8 + 62 + 7 + 9 + 91 + 390 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19898627991397) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64456141 + ... + 64764120.

It is an arithmetic number, because the mean of its divisors is an integer number (566953899525).

Almost surely, 2^{19898627991390} is an apocalyptic number.

19898627991390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19898627991390 is an abundant number, since it is smaller than the sum of its proper divisors (34528946363010).

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

19898627991390 is a wasteful number, since it uses less digits than its factorization.

19898627991390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129220362 (or 129220359 counting only the distinct ones).

The product of its (nonzero) digits is 952342272, while the sum is 81.

The spelling of 19898627991390 in words is "nineteen trillion, eight hundred ninety-eight billion, six hundred twenty-seven million, nine hundred ninety-one thousand, three hundred ninety".