193838981 has 16 divisors (see below), whose sum is σ = 235229184. Its totient is φ = 155929344.

The previous prime is 193838977. The next prime is 193838993. The reversal of 193838981 is 189838391.

It is a cyclic number.

It is not a de Polignac number, because 193838981 - 2² = 193838977 is a prime.

It is a super-2 number, since 2×193838981² = 75147101110236722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (193838941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43451 + ... + 47703.

It is an arithmetic number, because the mean of its divisors is an integer number (14701824).

Almost surely, 2^193838981 is an apocalyptic number.

It is an amenable number.

193838981 is a deficient number, since it is larger than the sum of its proper divisors (41390203).

193838981 is a wasteful number, since it uses less digits than its factorization.

193838981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4660.

The product of its digits is 373248, while the sum is 50.

The square root of 193838981 is about 13922.6068320556. The cubic root of 193838981 is about 578.7358326328.

The spelling of 193838981 in words is "one hundred ninety-three million, eight hundred thirty-eight thousand, nine hundred eighty-one".