19894542192 has 480 divisors, whose sum is σ = 70484377600. Its totient is φ = 5305906944.

The previous prime is 19894542169. The next prime is 19894542263. The reversal of 19894542192 is 29124549891.

19894542192 is a `hidden beast` number, since 1 + 9 + 8 + 9 + 4 + 542 + 1 + 92 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 40850973 + ... + 40851459.

Almost surely, 2^19894542192 is an apocalyptic number.

19894542192 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 19894542192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35242188800).

19894542192 is an abundant number, since it is smaller than the sum of its proper divisors (50589835408).

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

19894542192 is a wasteful number, since it uses less digits than its factorization.

19894542192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615 (or 597 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 54.

The spelling of 19894542192 in words is "nineteen billion, eight hundred ninety-four million, five hundred forty-two thousand, one hundred ninety-two".