381885 has 16 divisors (see below), whose sum is σ = 698496. Its totient is φ = 174528.

The previous prime is 381859. The next prime is 381911. The reversal of 381885 is 588183.

It is an interprime number because it is at equal distance from previous prime (381859) and next prime (381911).

It is not a de Polignac number, because 381885 - 2⁵ = 381853 is a prime.

It is a Curzon number.

381885 is a lucky number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1714 + ... + 1923.

It is an arithmetic number, because the mean of its divisors is an integer number (43656).

2³⁸¹⁸⁸⁵ is an apocalyptic number.

381885 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

381885 is a deficient number, since it is larger than the sum of its proper divisors (316611).

381885 is a wasteful number, since it uses less digits than its factorization.

381885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3652.

The product of its digits is 7680, while the sum is 33.

The square root of 381885 is about 617.9684457964. The cubic root of 381885 is about 72.5511331710.

The spelling of 381885 in words is "three hundred eighty-one thousand, eight hundred eighty-five".