381105 has 20 divisors (see below), whose sum is σ = 683892. Its totient is φ = 203040.

The previous prime is 381103. The next prime is 381167. The reversal of 381105 is 501183.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 186624 + 194481 = 432^2 + 441^2 .

It is not a de Polignac number, because 381105 - 2¹ = 381103 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381103) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 66 + ... + 875.

2³⁸¹¹⁰⁵ is an apocalyptic number.

It is an amenable number.

381105 is a deficient number, since it is larger than the sum of its proper divisors (302787).

381105 is an equidigital number, since it uses as much as digits as its factorization.

381105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958 (or 949 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 381105 is about 617.3370230271. The cubic root of 381105 is about 72.5017042802.

Adding to 381105 its reverse (501183), we get a palindrome (882288).

The spelling of 381105 in words is "three hundred eighty-one thousand, one hundred five".