381389 has 2 divisors, whose sum is σ = 381390. Its totient is φ = 381388.

The previous prime is 381383. The next prime is 381401. The reversal of 381389 is 983183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 280900 + 100489 = 530^2 + 317^2 .

It is a cyclic number.

It is not a de Polignac number, because 381389 - 2⁴ = 381373 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381383) 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 as a sum of consecutive naturals, namely, 190694 + 190695.

It is an arithmetic number, because the mean of its divisors is an integer number (190695).

2³⁸¹³⁸⁹ is an apocalyptic number.

It is an amenable number.

381389 is a deficient number, since it is larger than the sum of its proper divisors (1).

381389 is an equidigital number, since it uses as much as digits as its factorization.

381389 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 381389 is about 617.5670004137. The cubic root of 381389 is about 72.5197092670.

The spelling of 381389 in words is "three hundred eighty-one thousand, three hundred eighty-nine".