381605 has 8 divisors (see below), whose sum is σ = 523392. Its totient is φ = 261648.

The previous prime is 381569. The next prime is 381607. The reversal of 381605 is 506183.

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 381605 - 2⁶ = 381541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5417 + ... + 5486.

It is an arithmetic number, because the mean of its divisors is an integer number (65424).

2³⁸¹⁶⁰⁵ is an apocalyptic number.

381605 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

381605 is a deficient number, since it is larger than the sum of its proper divisors (141787).

381605 is a wasteful number, since it uses less digits than its factorization.

381605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10915.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 381605 is about 617.7418554704. The cubic root of 381605 is about 72.5333972172.

Adding to 381605 its reverse (506183), we get a palindrome (887788).

The spelling of 381605 in words is "three hundred eighty-one thousand, six hundred five".