378770257 has 2 divisors, whose sum is σ = 378770258. Its totient is φ = 378770256.

The previous prime is 378770239. The next prime is 378770281. The reversal of 378770257 is 752077873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 261177921 + 117592336 = 16161^2 + 10844^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378770257 is a prime.

It is not a weakly prime, because it can be changed into another prime (378770957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189385128 + 189385129.

It is an arithmetic number, because the mean of its divisors is an integer number (189385129).

Almost surely, 2^378770257 is an apocalyptic number.

It is an amenable number.

378770257 is a deficient number, since it is larger than the sum of its proper divisors (1).

378770257 is an equidigital number, since it uses as much as digits as its factorization.

378770257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576240, while the sum is 46.

The square root of 378770257 is about 19462.0208868452. The cubic root of 378770257 is about 723.5334648125.

The spelling of 378770257 in words is "three hundred seventy-eight million, seven hundred seventy thousand, two hundred fifty-seven".