19181870340 has 24 divisors (see below), whose sum is σ = 53709237120. Its totient is φ = 5115165408.

The previous prime is 19181870311. The next prime is 19181870363. The reversal of 19181870340 is 4307818191.

It is a junction number, because it is equal to n+sod(n) for n = 19181870292 and 19181870301.

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, 159848860 + ... + 159848979.

It is an arithmetic number, because the mean of its divisors is an integer number (2237884880).

Almost surely, 2^19181870340 is an apocalyptic number.

19181870340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19181870340 is an abundant number, since it is smaller than the sum of its proper divisors (34527366780).

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

19181870340 is a wasteful number, since it uses less digits than its factorization.

19181870340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319697851 (or 319697849 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 42.

The spelling of 19181870340 in words is "nineteen billion, one hundred eighty-one million, eight hundred seventy thousand, three hundred forty".