381815 has 8 divisors (see below), whose sum is σ = 523680. Its totient is φ = 261792.

The previous prime is 381793. The next prime is 381817. The reversal of 381815 is 518183.

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 381815 - 2⁸ = 381559 is a prime.

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 381815.

It is not an unprimeable number, because it can be changed into a prime (381817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5420 + ... + 5489.

It is an arithmetic number, because the mean of its divisors is an integer number (65460).

2³⁸¹⁸¹⁵ is an apocalyptic number.

381815 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

381815 is a deficient number, since it is larger than the sum of its proper divisors (141865).

381815 is a wasteful number, since it uses less digits than its factorization.

381815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10921.

The product of its digits is 960, while the sum is 26.

The square root of 381815 is about 617.9118060047. The cubic root of 381815 is about 72.5466999955.

Adding to 381815 its reverse (518183), we get a palindrome (899998).

It can be divided in two parts, 3 and 81815, that added together give a palindrome (81818).

The spelling of 381815 in words is "three hundred eighty-one thousand, eight hundred fifteen".