381818182 has 4 divisors (see below), whose sum is σ = 572727276. Its totient is φ = 190909090.

The previous prime is 381818161. The next prime is 381818183. The reversal of 381818182 is 281818183.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381818183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95454544 + ... + 95454547.

It is an arithmetic number, because the mean of its divisors is an integer number (143181819).

Almost surely, 2^381818182 is an apocalyptic number.

381818182 is a deficient number, since it is larger than the sum of its proper divisors (190909094).

381818182 is a wasteful number, since it uses less digits than its factorization.

381818182 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190909093.

The product of its digits is 24576, while the sum is 40.

The square root of 381818182 is about 19540.1684230203. The cubic root of 381818182 is about 725.4690152679.

Subtracting from 381818182 its reverse (281818183), we obtain a palindrome (99999999).

The spelling of 381818182 in words is "three hundred eighty-one million, eight hundred eighteen thousand, one hundred eighty-two".