381856818 has 16 divisors (see below), whose sum is σ = 872815680. Its totient is φ = 109101936.

The previous prime is 381856799. The next prime is 381856829. The reversal of 381856818 is 818658183.

381856818 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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, 4545873 + ... + 4545956.

It is an arithmetic number, because the mean of its divisors is an integer number (54550980).

Almost surely, 2^381856818 is an apocalyptic number.

381856818 is an abundant number, since it is smaller than the sum of its proper divisors (490958862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381856818 is a wasteful number, since it uses less digits than its factorization.

381856818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9091841.

The product of its digits is 368640, while the sum is 48.

The square root of 381856818 is about 19541.1570281803. The cubic root of 381856818 is about 725.4934843973.

The spelling of 381856818 in words is "three hundred eighty-one million, eight hundred fifty-six thousand, eight hundred eighteen".