838391 has 2 divisors, whose sum is σ = 838392. Its totient is φ = 838390.

The previous prime is 838379. The next prime is 838393. The reversal of 838391 is 193838.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 838391 - 2¹⁰ = 837367 is a prime.

It is a Sophie Germain prime.

Together with 838393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (838393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419195 + 419196.

It is an arithmetic number, because the mean of its divisors is an integer number (419196).

2⁸³⁸³⁹¹ is an apocalyptic number.

838391 is a deficient number, since it is larger than the sum of its proper divisors (1).

838391 is an equidigital number, since it uses as much as digits as its factorization.

838391 is an odious number, because the sum of its binary digits is odd.

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

The square root of 838391 is about 915.6369367823. The cubic root of 838391 is about 94.2935968966.

The spelling of 838391 in words is "eight hundred thirty-eight thousand, three hundred ninety-one".