380345657 has 2 divisors, whose sum is σ = 380345658. Its totient is φ = 380345656.

The previous prime is 380345627. The next prime is 380345671. The reversal of 380345657 is 756543083.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 278355856 + 101989801 = 16684^2 + 10099^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-380345657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (380345627) 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, 190172828 + 190172829.

It is an arithmetic number, because the mean of its divisors is an integer number (190172829).

Almost surely, 2^380345657 is an apocalyptic number.

It is an amenable number.

380345657 is a deficient number, since it is larger than the sum of its proper divisors (1).

380345657 is an equidigital number, since it uses as much as digits as its factorization.

380345657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 41.

The square root of 380345657 is about 19502.4525893540. The cubic root of 380345657 is about 724.5351960095.

The spelling of 380345657 in words is "three hundred eighty million, three hundred forty-five thousand, six hundred fifty-seven".