381915 has 40 divisors (see below), whose sum is σ = 731808. Its totient is φ = 190080.

The previous prime is 381911. The next prime is 381917. The reversal of 381915 is 519183.

It is not a de Polignac number, because 381915 - 2² = 381911 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

Its product of digits (1080) is a multiple of the sum of its prime divisors (72).

It is not an unprimeable number, because it can be changed into a prime (381911) 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 39 ways as a sum of consecutive naturals, for example, 9295 + ... + 9335.

2³⁸¹⁹¹⁵ is an apocalyptic number.

381915 is a deficient number, since it is larger than the sum of its proper divisors (349893).

381915 is a wasteful number, since it uses less digits than its factorization.

381915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 72 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 381915 is about 617.9927184037. The cubic root of 381915 is about 72.5530329375.

It can be divided in two parts, 381 and 915, that added together give a 4-th power (1296 = 6⁴).

The spelling of 381915 in words is "three hundred eighty-one thousand, nine hundred fifteen".