19189749964 has 96 divisors (see below), whose sum is σ = 43371417600. Its totient is φ = 7208866560.

The previous prime is 19189749961. The next prime is 19189750007. The reversal of 19189749964 is 46994798191.

It is a self number, because there is not a number n which added to its sum of digits gives 19189749964.

It is not an unprimeable number, because it can be changed into a prime (19189749961) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12852402 + ... + 12853894.

It is an arithmetic number, because the mean of its divisors is an integer number (451785600).

Almost surely, 2^19189749964 is an apocalyptic number.

19189749964 is a gapful number since it is divisible by the number (14) 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 19189749964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21685708800).

19189749964 is an abundant number, since it is smaller than the sum of its proper divisors (24181667636).

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

19189749964 is a wasteful number, since it uses less digits than its factorization.

19189749964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2983 (or 2981 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 67.

The spelling of 19189749964 in words is "nineteen billion, one hundred eighty-nine million, seven hundred forty-nine thousand, nine hundred sixty-four".