381863 has 4 divisors (see below), whose sum is σ = 387168. Its totient is φ = 376560.

The previous prime is 381859. The next prime is 381911. The reversal of 381863 is 368183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 368183 = 283 ⋅1301.

It is a cyclic number.

It is not a de Polignac number, because 381863 - 2² = 381859 is a prime.

It is a Duffinian 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2543 + ... + 2688.

It is an arithmetic number, because the mean of its divisors is an integer number (96792).

2³⁸¹⁸⁶³ is an apocalyptic number.

381863 is a deficient number, since it is larger than the sum of its proper divisors (5305).

381863 is an equidigital number, since it uses as much as digits as its factorization.

381863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5304.

The product of its digits is 3456, while the sum is 29.

The square root of 381863 is about 617.9506452784. The cubic root of 381863 is about 72.5497399457.

The spelling of 381863 in words is "three hundred eighty-one thousand, eight hundred sixty-three".