181938382 has 8 divisors (see below), whose sum is σ = 272992896. Its totient is φ = 90940752.

The previous prime is 181938377. The next prime is 181938389. The reversal of 181938382 is 283839181.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181938389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5038 + ... + 19729.

It is an arithmetic number, because the mean of its divisors is an integer number (34124112).

Almost surely, 2^181938382 is an apocalyptic number.

181938382 is a deficient number, since it is larger than the sum of its proper divisors (91054514).

181938382 is a wasteful number, since it uses less digits than its factorization.

181938382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28442.

The product of its digits is 82944, while the sum is 43.

The square root of 181938382 is about 13488.4536548857. The cubic root of 181938382 is about 566.6411489470.

The spelling of 181938382 in words is "one hundred eighty-one million, nine hundred thirty-eight thousand, three hundred eighty-two".