378518381 has 2 divisors, whose sum is σ = 378518382. Its totient is φ = 378518380.

The previous prime is 378518377. The next prime is 378518389. The reversal of 378518381 is 183815873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 348158281 + 30360100 = 18659^2 + 5510^2 .

It is a cyclic number.

It is not a de Polignac number, because 378518381 - 2² = 378518377 is a prime.

It is a super-2 number, since 2×378518381² = 286552329509722322, 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 (378518389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189259190 + 189259191.

It is an arithmetic number, because the mean of its divisors is an integer number (189259191).

Almost surely, 2^378518381 is an apocalyptic number.

It is an amenable number.

378518381 is a deficient number, since it is larger than the sum of its proper divisors (1).

378518381 is an equidigital number, since it uses as much as digits as its factorization.

378518381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 44.

The square root of 378518381 is about 19455.5488485933. The cubic root of 378518381 is about 723.3730499592.

The spelling of 378518381 in words is "three hundred seventy-eight million, five hundred eighteen thousand, three hundred eighty-one".