19891274936 has 32 divisors (see below), whose sum is σ = 40171383840. Its totient is φ = 9179146368.

The previous prime is 19891274929. The next prime is 19891275011. The reversal of 19891274936 is 63947219891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 941885 + ... + 962771.

It is an arithmetic number, because the mean of its divisors is an integer number (1255355745).

Almost surely, 2^19891274936 is an apocalyptic number.

It is an amenable number.

19891274936 is an abundant number, since it is smaller than the sum of its proper divisors (20280108904).

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

19891274936 is a wasteful number, since it uses less digits than its factorization.

19891274936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30063 (or 30059 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 59.

The spelling of 19891274936 in words is "nineteen billion, eight hundred ninety-one million, two hundred seventy-four thousand, nine hundred thirty-six".