378897391 has 2 divisors, whose sum is σ = 378897392. Its totient is φ = 378897390.

The previous prime is 378897367. The next prime is 378897397. The reversal of 378897391 is 193798873.

It is a strong prime.

It is an emirp because it is prime and its reverse (193798873) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 378897391 - 2¹⁵ = 378864623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378897397) 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, 189448695 + 189448696.

It is an arithmetic number, because the mean of its divisors is an integer number (189448696).

Almost surely, 2^378897391 is an apocalyptic number.

378897391 is a deficient number, since it is larger than the sum of its proper divisors (1).

378897391 is an equidigital number, since it uses as much as digits as its factorization.

378897391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2286144, while the sum is 55.

The square root of 378897391 is about 19465.2868203888. The cubic root of 378897391 is about 723.6144069422.

The spelling of 378897391 in words is "three hundred seventy-eight million, eight hundred ninety-seven thousand, three hundred ninety-one".