194793187389889 has 9 divisors (see below), whose sum is σ = 214111688774529. Its totient is φ = 177084576240660.

The previous prime is 194793187389833. The next prime is 194793187389917. The reversal of 194793187389889 is 988983781397491.

The square root of 194793187389889 is 13956833.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 194793187389889 - 2¹⁹ = 194793186865601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 194793187389797 and 194793187389806.

It is not an unprimeable number, because it can be changed into a prime (194793187389289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 152890762 + ... + 154159564.

Almost surely, 2^{194793187389889} is an apocalyptic number.

194793187389889 is the 13956833-rd square number.

194793187389889 is the 6978417-th centered octagonal number.

It is an amenable number.

194793187389889 is a deficient number, since it is larger than the sum of its proper divisors (19318501384640).

194793187389889 is an frugal number, since it uses more digits than its factorization.

194793187389889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2537628 (or 1268814 counting only the distinct ones).

The product of its digits is 47405481984, while the sum is 94.

The spelling of 194793187389889 in words is "one hundred ninety-four trillion, seven hundred ninety-three billion, one hundred eighty-seven million, three hundred eighty-nine thousand, eight hundred eighty-nine".