19891348340 has 24 divisors (see below), whose sum is σ = 41823372192. Its totient is φ = 7946722080.

The previous prime is 19891348339. The next prime is 19891348357. The reversal of 19891348340 is 4384319891.

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, 596954 + ... + 629393.

It is an arithmetic number, because the mean of its divisors is an integer number (1742640508).

Almost surely, 2^19891348340 is an apocalyptic number.

19891348340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19891348340 is an abundant number, since it is smaller than the sum of its proper divisors (21932023852).

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

19891348340 is a wasteful number, since it uses less digits than its factorization.

19891348340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227167 (or 1227165 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 19891348340 in words is "nineteen billion, eight hundred ninety-one million, three hundred forty-eight thousand, three hundred forty".