381785 has 8 divisors (see below), whose sum is σ = 474120. Its totient is φ = 294784.

The previous prime is 381761. The next prime is 381791. The reversal of 381785 is 587183.

381785 is nontrivially palindromic in base 8.

It can be written as a sum of positive squares in 4 ways, for example, as 8464 + 373321 = 92^2 + 611^2 .

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 381785 - 2⁸ = 381529 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 1172 + ... + 1461.

It is an arithmetic number, because the mean of its divisors is an integer number (59265).

2³⁸¹⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

381785 is a deficient number, since it is larger than the sum of its proper divisors (92335).

381785 is a wasteful number, since it uses less digits than its factorization.

381785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2667.

The product of its digits is 6720, while the sum is 32.

The square root of 381785 is about 617.8875302189. The cubic root of 381785 is about 72.5447998973.

It can be divided in two parts, 38178 and 5, that added together give a palindrome (38183).

The spelling of 381785 in words is "three hundred eighty-one thousand, seven hundred eighty-five".