181938349 has 8 divisors (see below), whose sum is σ = 195973632. Its totient is φ = 168413520.

The previous prime is 181938313. The next prime is 181938377. The reversal of 181938349 is 943839181.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181938349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 181938299 and 181938308.

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 7 ways as a sum of consecutive naturals, for example, 126874 + ... + 128299.

It is an arithmetic number, because the mean of its divisors is an integer number (24496704).

Almost surely, 2^181938349 is an apocalyptic number.

It is an amenable number.

181938349 is a deficient number, since it is larger than the sum of its proper divisors (14035283).

181938349 is a wasteful number, since it uses less digits than its factorization.

181938349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255227.

The product of its digits is 186624, while the sum is 46.

The square root of 181938349 is about 13488.4524316172. The cubic root of 181938349 is about 566.6411146879.

The spelling of 181938349 in words is "one hundred eighty-one million, nine hundred thirty-eight thousand, three hundred forty-nine".