382306781 has 2 divisors, whose sum is σ = 382306782. Its totient is φ = 382306780.

The previous prime is 382306777. The next prime is 382306801. The reversal of 382306781 is 187603283.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 380640100 + 1666681 = 19510^2 + 1291^2 .

It is a cyclic number.

It is not a de Polignac number, because 382306781 - 2² = 382306777 is a prime.

It is a super-2 number, since 2×382306781² = 292316949597163922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (382306721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191153390 + 191153391.

It is an arithmetic number, because the mean of its divisors is an integer number (191153391).

Almost surely, 2^382306781 is an apocalyptic number.

It is an amenable number.

382306781 is a deficient number, since it is larger than the sum of its proper divisors (1).

382306781 is an equidigital number, since it uses as much as digits as its factorization.

382306781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 382306781 is about 19552.6668513530. Note that the first 3 decimals coincide. The cubic root of 382306781 is about 725.7783355687.

The spelling of 382306781 in words is "three hundred eighty-two million, three hundred six thousand, seven hundred eighty-one".