381365 has 8 divisors (see below), whose sum is σ = 463320. Its totient is φ = 301312.

The previous prime is 381347. The next prime is 381371. The reversal of 381365 is 563183.

It can be written as a sum of positive squares in 4 ways, for example, as 61009 + 320356 = 247^2 + 566^2 .

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 381365 - 2⁶ = 381301 is a prime.

It is a super-3 number, since 3×381365³ = 166396333859406375, which contains 333 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 381365.

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, 17 + ... + 873.

It is an arithmetic number, because the mean of its divisors is an integer number (57915).

2³⁸¹³⁶⁵ is an apocalyptic number.

It is an amenable number.

381365 is a deficient number, since it is larger than the sum of its proper divisors (81955).

381365 is an equidigital number, since it uses as much as digits as its factorization.

381365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951.

The product of its digits is 2160, while the sum is 26.

The square root of 381365 is about 617.5475690180. The cubic root of 381365 is about 72.5181880646.

The spelling of 381365 in words is "three hundred eighty-one thousand, three hundred sixty-five".