193944319138 has 8 divisors (see below), whose sum is σ = 290936419740. Its totient is φ = 96965512560.

The previous prime is 193944319133. The next prime is 193944319139. The reversal of 193944319138 is 831913449391.

It can be written as a sum of positive squares in 2 ways, for example, as 193923094689 + 21224449 = 440367^2 + 4607^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×193944319138² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (193944319133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3286953 + ... + 3345436.

Almost surely, 2^193944319138 is an apocalyptic number.

193944319138 is a deficient number, since it is larger than the sum of its proper divisors (96992100602).

193944319138 is a wasteful number, since it uses less digits than its factorization.

193944319138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6647012.

The product of its digits is 2519424, while the sum is 55.

The spelling of 193944319138 in words is "one hundred ninety-three billion, nine hundred forty-four million, three hundred nineteen thousand, one hundred thirty-eight".