381839 has 4 divisors (see below), whose sum is σ = 383520. Its totient is φ = 380160.

The previous prime is 381817. The next prime is 381841. The reversal of 381839 is 938183.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381839 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 (381859) 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, 434 + ... + 975.

It is an arithmetic number, because the mean of its divisors is an integer number (95880).

2³⁸¹⁸³⁹ is an apocalyptic number.

381839 is a deficient number, since it is larger than the sum of its proper divisors (1681).

381839 is a wasteful number, since it uses less digits than its factorization.

381839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680.

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

The square root of 381839 is about 617.9312259467. The cubic root of 381839 is about 72.5482200025.

The spelling of 381839 in words is "three hundred eighty-one thousand, eight hundred thirty-nine".