378045649 has 2 divisors, whose sum is σ = 378045650. Its totient is φ = 378045648.

The previous prime is 378045623. The next prime is 378045671. The reversal of 378045649 is 946540873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 295599249 + 82446400 = 17193^2 + 9080^2 .

It is a cyclic number.

It is not a de Polignac number, because 378045649 - 2⁵ = 378045617 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 378045599 and 378045608.

It is not a weakly prime, because it can be changed into another prime (378045149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189022824 + 189022825.

It is an arithmetic number, because the mean of its divisors is an integer number (189022825).

Almost surely, 2^378045649 is an apocalyptic number.

It is an amenable number.

378045649 is a deficient number, since it is larger than the sum of its proper divisors (1).

378045649 is an equidigital number, since it uses as much as digits as its factorization.

378045649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 46.

The square root of 378045649 is about 19443.3960253861. The cubic root of 378045649 is about 723.0717840557.

The spelling of 378045649 in words is "three hundred seventy-eight million, forty-five thousand, six hundred forty-nine".