194384873881 has 27 divisors (see below), whose sum is σ = 215908938973. Its totient is φ = 174875006240.

The previous prime is 194384873873. The next prime is 194384873959. The reversal of 194384873881 is 188378483491.

The square root of 194384873881 is 440891.

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

194384873881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 130820379481 + 63564494400 = 361691^2 + 252120^2 .

It is not a de Polignac number, because 194384873881 - 2³ = 194384873873 is a prime.

It is a super-2 number, since 2×194384873881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194384873801) 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 26 ways as a sum of consecutive naturals, for example, 722620215 + ... + 722620483.

Almost surely, 2^194384873881 is an apocalyptic number.

194384873881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

194384873881 is the 440891-st square number.

194384873881 is the 220446-th centered octagonal number.

It is an amenable number.

194384873881 is a deficient number, since it is larger than the sum of its proper divisors (21524065092).

194384873881 is an frugal number, since it uses more digits than its factorization.

194384873881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858 (or 429 counting only the distinct ones).

The product of its digits is 37158912, while the sum is 64.

Multiplying 194384873881 by its sum of digits (64), we get a square (12440631928384 = 3527128²).

The spelling of 194384873881 in words is "one hundred ninety-four billion, three hundred eighty-four million, eight hundred seventy-three thousand, eight hundred eighty-one".