381809347 has 2 divisors, whose sum is σ = 381809348. Its totient is φ = 381809346.

The previous prime is 381809339. The next prime is 381809383. The reversal of 381809347 is 743908183.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (743908183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381809347 - 2³ = 381809339 is a prime.

It is not a weakly prime, because it can be changed into another prime (381809317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190904673 + 190904674.

It is an arithmetic number, because the mean of its divisors is an integer number (190904674).

Almost surely, 2^381809347 is an apocalyptic number.

381809347 is a deficient number, since it is larger than the sum of its proper divisors (1).

381809347 is an equidigital number, since it uses as much as digits as its factorization.

381809347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 381809347 is about 19539.9423489426. The cubic root of 381809347 is about 725.4634196131.

The spelling of 381809347 in words is "three hundred eighty-one million, eight hundred nine thousand, three hundred forty-seven".