19138420043928 has 24 divisors (see below), whose sum is σ = 51833220952500. Its totient is φ = 6379473347952.

The previous prime is 19138420043921. The next prime is 19138420043947. The reversal of 19138420043928 is 82934002483191.

19138420043928 is a `hidden beast` number, since 1 + 9 + 1 + 384 + 200 + 4 + 39 + 28 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19138420043921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 132905694678 + ... + 132905694821.

Almost surely, 2^{19138420043928} is an apocalyptic number.

19138420043928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19138420043928 is an abundant number, since it is smaller than the sum of its proper divisors (32694800908572).

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

19138420043928 is a wasteful number, since it uses less digits than its factorization.

19138420043928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265811389511 (or 265811389504 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The spelling of 19138420043928 in words is "nineteen trillion, one hundred thirty-eight billion, four hundred twenty million, forty-three thousand, nine hundred twenty-eight".