381805 has 8 divisors (see below), whose sum is σ = 482400. Its totient is φ = 289296.

The previous prime is 381793. The next prime is 381817. The reversal of 381805 is 508183.

It is an interprime number because it is at equal distance from previous prime (381793) and next prime (381817).

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 381805 - 2¹³ = 373613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1915 + ... + 2104.

It is an arithmetic number, because the mean of its divisors is an integer number (60300).

2³⁸¹⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

381805 is a deficient number, since it is larger than the sum of its proper divisors (100595).

381805 is a wasteful number, since it uses less digits than its factorization.

381805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4043.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 381805 is about 617.9037141821. The cubic root of 381805 is about 72.5460666405.

Adding to 381805 its reverse (508183), we get a palindrome (889988).

The spelling of 381805 in words is "three hundred eighty-one thousand, eight hundred five".