381855 has 8 divisors (see below), whose sum is σ = 610992. Its totient is φ = 203648.

The previous prime is 381853. The next prime is 381859. The reversal of 381855 is 558183.

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 not a de Polignac number, because 381855 - 2¹ = 381853 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381853) 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, 12714 + ... + 12743.

It is an arithmetic number, because the mean of its divisors is an integer number (76374).

2³⁸¹⁸⁵⁵ is an apocalyptic number.

381855 is a deficient number, since it is larger than the sum of its proper divisors (229137).

381855 is a wasteful number, since it uses less digits than its factorization.

381855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25465.

The product of its digits is 4800, while the sum is 30.

The square root of 381855 is about 617.9441722356. The cubic root of 381855 is about 72.5492333050.

The spelling of 381855 in words is "three hundred eighty-one thousand, eight hundred fifty-five".