19937439999 has 24 divisors (see below), whose sum is σ = 29846856000. Its totient is φ = 12809482560.

The previous prime is 19937439971. The next prime is 19937440001. The reversal of 19937439999 is 99993473991.

19937439999 is a `hidden beast` number, since 19 + 93 + 7 + 439 + 9 + 99 = 666.

It is a Cunningham number, because it is equal to 141200²-1.

It is not a de Polignac number, because 19937439999 - 2⁷ = 19937439871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19937439959) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 70602 + ... + 211800.

It is an arithmetic number, because the mean of its divisors is an integer number (1243619000).

Almost surely, 2^19937439999 is an apocalyptic number.

19937439999 is a deficient number, since it is larger than the sum of its proper divisors (9909416001).

19937439999 is a wasteful number, since it uses less digits than its factorization.

19937439999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141775 (or 141772 counting only the distinct ones).

The product of its digits is 133923132, while the sum is 72.

The spelling of 19937439999 in words is "nineteen billion, nine hundred thirty-seven million, four hundred thirty-nine thousand, nine hundred ninety-nine".