381215 has 4 divisors (see below), whose sum is σ = 457464. Its totient is φ = 304968.

The previous prime is 381209. The next prime is 381221. The reversal of 381215 is 512183.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (381209) and next prime (381221).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381215 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 38117 + ... + 38126.

It is an arithmetic number, because the mean of its divisors is an integer number (114366).

2³⁸¹²¹⁵ is an apocalyptic number.

381215 is a deficient number, since it is larger than the sum of its proper divisors (76249).

381215 is an equidigital number, since it uses as much as digits as its factorization.

381215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76248.

The product of its digits is 240, while the sum is 20.

The square root of 381215 is about 617.4261089394. The cubic root of 381215 is about 72.5086791037.

Adding to 381215 its reverse (512183), we get a palindrome (893398).

It can be divided in two parts, 3 and 81215, that added together give a palindrome (81218).

The spelling of 381215 in words is "three hundred eighty-one thousand, two hundred fifteen".