381739 has 2 divisors, whose sum is σ = 381740. Its totient is φ = 381738.

The previous prime is 381737. The next prime is 381749. The reversal of 381739 is 937183.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 381739 - 2¹ = 381737 is a prime.

Together with 381737, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381739.

It is not a weakly prime, because it can be changed into another prime (381737) 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, 190869 + 190870.

It is an arithmetic number, because the mean of its divisors is an integer number (190870).

2³⁸¹⁷³⁹ is an apocalyptic number.

381739 is a deficient number, since it is larger than the sum of its proper divisors (1).

381739 is an equidigital number, since it uses as much as digits as its factorization.

381739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 31.

The square root of 381739 is about 617.8503054948. The cubic root of 381739 is about 72.5418862201.

The spelling of 381739 in words is "three hundred eighty-one thousand, seven hundred thirty-nine".