381381839 has 2 divisors, whose sum is σ = 381381840. Its totient is φ = 381381838.

The previous prime is 381381817. The next prime is 381381853. The reversal of 381381839 is 938183183.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381381839 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381381839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381383839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190690919 + 190690920.

It is an arithmetic number, because the mean of its divisors is an integer number (190690920).

Almost surely, 2^381381839 is an apocalyptic number.

381381839 is a deficient number, since it is larger than the sum of its proper divisors (1).

381381839 is an equidigital number, since it uses as much as digits as its factorization.

381381839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 44.

The square root of 381381839 is about 19528.9999487941. Note that the first 4 decimals coincide. The cubic root of 381381839 is about 725.1925538489.

The spelling of 381381839 in words is "three hundred eighty-one million, three hundred eighty-one thousand, eight hundred thirty-nine".