19138337938 has 16 divisors (see below), whose sum is σ = 28977462360. Its totient is φ = 9479223936.

The previous prime is 19138337903. The next prime is 19138337951. The reversal of 19138337938 is 83973383191.

It can be written as a sum of positive squares in 4 ways, for example, as 11676315249 + 7462022689 = 108057^2 + 86383^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1421856 + ... + 1435252.

Almost surely, 2^19138337938 is an apocalyptic number.

19138337938 is a deficient number, since it is larger than the sum of its proper divisors (9839124422).

19138337938 is a wasteful number, since it uses less digits than its factorization.

19138337938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20061.

The product of its digits is 2939328, while the sum is 55.

The spelling of 19138337938 in words is "nineteen billion, one hundred thirty-eight million, three hundred thirty-seven thousand, nine hundred thirty-eight".