378885869 has 2 divisors, whose sum is σ = 378885870. Its totient is φ = 378885868.

The previous prime is 378885803. The next prime is 378885889. The reversal of 378885869 is 968588873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 374925769 + 3960100 = 19363^2 + 1990^2 .

It is a cyclic number.

It is not a de Polignac number, because 378885869 - 2²⁰ = 377837293 is a prime.

It is a super-2 number, since 2×378885869² = 287109003455770322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378885889) 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, 189442934 + 189442935.

It is an arithmetic number, because the mean of its divisors is an integer number (189442935).

Almost surely, 2^378885869 is an apocalyptic number.

It is an amenable number.

378885869 is a deficient number, since it is larger than the sum of its proper divisors (1).

378885869 is an equidigital number, since it uses as much as digits as its factorization.

378885869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23224320, while the sum is 62.

The square root of 378885869 is about 19464.9908553793. The cubic root of 378885869 is about 723.6070720015.

The spelling of 378885869 in words is "three hundred seventy-eight million, eight hundred eighty-five thousand, eight hundred sixty-nine".