378345391 has 2 divisors, whose sum is σ = 378345392. Its totient is φ = 378345390.

The previous prime is 378345389. The next prime is 378345403. The reversal of 378345391 is 193543873.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 378345391 - 2¹ = 378345389 is a prime.

Together with 378345389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378345311) 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, 189172695 + 189172696.

It is an arithmetic number, because the mean of its divisors is an integer number (189172696).

Almost surely, 2^378345391 is an apocalyptic number.

378345391 is a deficient number, since it is larger than the sum of its proper divisors (1).

378345391 is an equidigital number, since it uses as much as digits as its factorization.

378345391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 43.

The square root of 378345391 is about 19451.1025651504. The cubic root of 378345391 is about 723.2628348167.

The spelling of 378345391 in words is "three hundred seventy-eight million, three hundred forty-five thousand, three hundred ninety-one".