378915289 has 2 divisors, whose sum is σ = 378915290. Its totient is φ = 378915288.

The previous prime is 378915281. The next prime is 378915301. The reversal of 378915289 is 982519873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 372181264 + 6734025 = 19292^2 + 2595^2 .

It is an emirp because it is prime and its reverse (982519873) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 378915289 - 2³ = 378915281 is a prime.

It is not a weakly prime, because it can be changed into another prime (378915281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189457644 + 189457645.

It is an arithmetic number, because the mean of its divisors is an integer number (189457645).

Almost surely, 2^378915289 is an apocalyptic number.

It is an amenable number.

378915289 is a deficient number, since it is larger than the sum of its proper divisors (1).

378915289 is an equidigital number, since it uses as much as digits as its factorization.

378915289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 52.

The square root of 378915289 is about 19465.7465564514. The cubic root of 378915289 is about 723.6258005693.

The spelling of 378915289 in words is "three hundred seventy-eight million, nine hundred fifteen thousand, two hundred eighty-nine".