378263569 has 2 divisors, whose sum is σ = 378263570. Its totient is φ = 378263568.

The previous prime is 378263551. The next prime is 378263591. The reversal of 378263569 is 965362873.

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., 319158225 + 59105344 = 17865^2 + 7688^2 .

It is a cyclic number.

It is not a de Polignac number, because 378263569 - 2⁹ = 378263057 is a prime.

It is a super-2 number, since 2×378263569² = 286166655265235522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (378263539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189131784 + 189131785.

It is an arithmetic number, because the mean of its divisors is an integer number (189131785).

Almost surely, 2^378263569 is an apocalyptic number.

It is an amenable number.

378263569 is a deficient number, since it is larger than the sum of its proper divisors (1).

378263569 is an equidigital number, since it uses as much as digits as its factorization.

378263569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 49.

The square root of 378263569 is about 19448.9991773356. Note that the first 3 decimals coincide. The cubic root of 378263569 is about 723.2106927972.

The spelling of 378263569 in words is "three hundred seventy-eight million, two hundred sixty-three thousand, five hundred sixty-nine".