19427138892 has 144 divisors (see below), whose sum is σ = 59484140352. Its totient is φ = 5218836480.

The previous prime is 19427138881. The next prime is 19427138893. The reversal of 19427138892 is 29883172491.

19427138892 is a `hidden beast` number, since 1 + 9 + 427 + 138 + 89 + 2 = 666.

Its product of digits (1741824) is a multiple of the sum of its prime factors (4608).

It is not an unprimeable number, because it can be changed into a prime (19427138893) 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 47 ways as a sum of consecutive naturals, for example, 6223092 + ... + 6226212.

It is an arithmetic number, because the mean of its divisors is an integer number (413084308).

Almost surely, 2^19427138892 is an apocalyptic number.

19427138892 is a gapful number since it is divisible by the number (12) 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 19427138892, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29742070176).

19427138892 is an abundant number, since it is smaller than the sum of its proper divisors (40057001460).

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

19427138892 is a wasteful number, since it uses less digits than its factorization.

19427138892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4608 (or 4603 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The spelling of 19427138892 in words is "nineteen billion, four hundred twenty-seven million, one hundred thirty-eight thousand, eight hundred ninety-two".