19193998940987 has 16 divisors (see below), whose sum is σ = 21072199347360. Its totient is φ = 17376306085632.

The previous prime is 19193998940933. The next prime is 19193998940989. The reversal of 19193998940987 is 78904989939191.

It is not a de Polignac number, because 19193998940987 - 2²⁶ = 19193931832123 is a prime.

It is a super-2 number, since 2×19193998940987² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19193998940899 and 19193998940908.

It is not an unprimeable number, because it can be changed into a prime (19193998940989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64774412 + ... + 65070057.

It is an arithmetic number, because the mean of its divisors is an integer number (1317012459210).

Almost surely, 2^{19193998940987} is an apocalyptic number.

19193998940987 is a deficient number, since it is larger than the sum of its proper divisors (1878200406373).

19193998940987 is a wasteful number, since it uses less digits than its factorization.

19193998940987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129844702.

The product of its (nonzero) digits is 2857026816, while the sum is 86.

The spelling of 19193998940987 in words is "nineteen trillion, one hundred ninety-three billion, nine hundred ninety-eight million, nine hundred forty thousand, nine hundred eighty-seven".