380343781 has 2 divisors, whose sum is σ = 380343782. Its totient is φ = 380343780.

The previous prime is 380343779. The next prime is 380343811. The reversal of 380343781 is 187343083.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 250588900 + 129754881 = 15830^2 + 11391^2 .

It is a cyclic number.

It is not a de Polignac number, because 380343781 - 2¹ = 380343779 is a prime.

It is a super-2 number, since 2×380343781² = 289322783490751922, which contains 22 as substring.

Together with 380343779, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 380343781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (380343701) 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, 190171890 + 190171891.

It is an arithmetic number, because the mean of its divisors is an integer number (190171891).

Almost surely, 2^380343781 is an apocalyptic number.

It is an amenable number.

380343781 is a deficient number, since it is larger than the sum of its proper divisors (1).

380343781 is an equidigital number, since it uses as much as digits as its factorization.

380343781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 380343781 is about 19502.4044927799. The cubic root of 380343781 is about 724.5340047858.

The spelling of 380343781 in words is "three hundred eighty million, three hundred forty-three thousand, seven hundred eighty-one".