381801 has 8 divisors (see below), whose sum is σ = 581824. Its totient is φ = 218160.

The previous prime is 381793. The next prime is 381817. The reversal of 381801 is 108183.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 381801 - 2³ = 381793 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 18181 = 381801 / (3 + 8 + 1 + 8 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381841) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 9070 + ... + 9111.

It is an arithmetic number, because the mean of its divisors is an integer number (72728).

2³⁸¹⁸⁰¹ is an apocalyptic number.

It is an amenable number.

381801 is a deficient number, since it is larger than the sum of its proper divisors (200023).

381801 is a wasteful number, since it uses less digits than its factorization.

381801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18191.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 381801 is about 617.9004774233. The cubic root of 381801 is about 72.5458132954.

381801 divided by its sum of digits (21) gives a palindrome (18181).

Adding to 381801 its reverse (108183), we get a palindrome (489984).

The spelling of 381801 in words is "three hundred eighty-one thousand, eight hundred one".