381318739 has 2 divisors, whose sum is σ = 381318740. Its totient is φ = 381318738.

The previous prime is 381318677. The next prime is 381318757. The reversal of 381318739 is 937813183.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 381318739 - 2⁷ = 381318611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 381318695 and 381318704.

It is not a weakly prime, because it can be changed into another prime (381318779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190659369 + 190659370.

It is an arithmetic number, because the mean of its divisors is an integer number (190659370).

Almost surely, 2^381318739 is an apocalyptic number.

381318739 is a deficient number, since it is larger than the sum of its proper divisors (1).

381318739 is an equidigital number, since it uses as much as digits as its factorization.

381318739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 381318739 is about 19527.3843358500. The cubic root of 381318739 is about 725.1525570361.

The spelling of 381318739 in words is "three hundred eighty-one million, three hundred eighteen thousand, seven hundred thirty-nine".