378305657 has 2 divisors, whose sum is σ = 378305658. Its totient is φ = 378305656.

The previous prime is 378305639. The next prime is 378305659. The reversal of 378305657 is 756503873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 323856016 + 54449641 = 17996^2 + 7379^2 .

It is a cyclic number.

It is not a de Polignac number, because 378305657 - 2²⁴ = 361528441 is a prime.

Together with 378305659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (378305659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189152828 + 189152829.

It is an arithmetic number, because the mean of its divisors is an integer number (189152829).

Almost surely, 2^378305657 is an apocalyptic number.

It is an amenable number.

378305657 is a deficient number, since it is larger than the sum of its proper divisors (1).

378305657 is an equidigital number, since it uses as much as digits as its factorization.

378305657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 529200, while the sum is 44.

The square root of 378305657 is about 19450.0811566430. The cubic root of 378305657 is about 723.2375148029.

The spelling of 378305657 in words is "three hundred seventy-eight million, three hundred five thousand, six hundred fifty-seven".