19439188156 has 12 divisors (see below), whose sum is σ = 34742379168. Its totient is φ = 9512794112.

The previous prime is 19439188147. The next prime is 19439188159. The reversal of 19439188156 is 65188193491.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 19439188097 and 19439188106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19439188159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51699781 + ... + 51700156.

It is an arithmetic number, because the mean of its divisors is an integer number (2895198264).

Almost surely, 2^19439188156 is an apocalyptic number.

It is an amenable number.

19439188156 is a deficient number, since it is larger than the sum of its proper divisors (15303191012).

19439188156 is a wasteful number, since it uses less digits than its factorization.

19439188156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103399988 (or 103399986 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 55.

The spelling of 19439188156 in words is "nineteen billion, four hundred thirty-nine million, one hundred eighty-eight thousand, one hundred fifty-six".