381893 has 4 divisors (see below), whose sum is σ = 383148. Its totient is φ = 380640.

The previous prime is 381859. The next prime is 381911. The reversal of 381893 is 398183.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 268324 + 113569 = 518^2 + 337^2 .

It is a cyclic number.

It is not a de Polignac number, because 381893 - 2⁸ = 381637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381853) by changing a digit.

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, 155 + ... + 887.

It is an arithmetic number, because the mean of its divisors is an integer number (95787).

2³⁸¹⁸⁹³ is an apocalyptic number.

It is an amenable number.

381893 is a deficient number, since it is larger than the sum of its proper divisors (1255).

381893 is an equidigital number, since it uses as much as digits as its factorization.

381893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254.

The product of its digits is 5184, while the sum is 32.

The square root of 381893 is about 617.9749185849. The cubic root of 381893 is about 72.5516397852.

Subtracting 381893 from its reverse (398183), we obtain a triangular number (16290 = T₁₈₀).

The spelling of 381893 in words is "three hundred eighty-one thousand, eight hundred ninety-three".