381804 has 12 divisors (see below), whose sum is σ = 890904. Its totient is φ = 127264.

The previous prime is 381793. The next prime is 381817. The reversal of 381804 is 408183.

381804 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15897 + ... + 15920.

It is an arithmetic number, because the mean of its divisors is an integer number (74242).

2³⁸¹⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

381804 is an abundant number, since it is smaller than the sum of its proper divisors (509100).

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

381804 is a wasteful number, since it uses less digits than its factorization.

381804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31824 (or 31822 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 381804 is about 617.9029049940. The cubic root of 381804 is about 72.5460033044.

Adding to 381804 its reverse (408183), we get a palindrome (789987).

The spelling of 381804 in words is "three hundred eighty-one thousand, eight hundred four".