381765 has 16 divisors (see below), whose sum is σ = 631296. Its totient is φ = 196800.

The previous prime is 381761. The next prime is 381791. The reversal of 381765 is 567183.

It is not a de Polignac number, because 381765 - 2² = 381761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55 + ... + 875.

It is an arithmetic number, because the mean of its divisors is an integer number (39456).

2³⁸¹⁷⁶⁵ is an apocalyptic number.

It is an amenable number.

381765 is a deficient number, since it is larger than the sum of its proper divisors (249531).

381765 is a wasteful number, since it uses less digits than its factorization.

381765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860.

The product of its digits is 5040, while the sum is 30.

The square root of 381765 is about 617.8713458318. The cubic root of 381765 is about 72.5435331099.

The spelling of 381765 in words is "three hundred eighty-one thousand, seven hundred sixty-five".