380387281 has 2 divisors, whose sum is σ = 380387282. Its totient is φ = 380387280.

The previous prime is 380387243. The next prime is 380387297. The reversal of 380387281 is 182783083.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193655056 + 186732225 = 13916^2 + 13665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-380387281 is a prime.

It is a super-2 number, since 2×380387281² = 289388967093145922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (380387881) 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, 190193640 + 190193641.

It is an arithmetic number, because the mean of its divisors is an integer number (190193641).

Almost surely, 2^380387281 is an apocalyptic number.

It is an amenable number.

380387281 is a deficient number, since it is larger than the sum of its proper divisors (1).

380387281 is an equidigital number, since it uses as much as digits as its factorization.

380387281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 380387281 is about 19503.5197079912. The cubic root of 380387281 is about 724.5616254361.

The spelling of 380387281 in words is "three hundred eighty million, three hundred eighty-seven thousand, two hundred eighty-one".