378991307 has 2 divisors, whose sum is σ = 378991308. Its totient is φ = 378991306.

The previous prime is 378991297. The next prime is 378991339. The reversal of 378991307 is 703199873.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 378991307 - 2⁶ = 378991243 is a prime.

It is not a weakly prime, because it can be changed into another prime (378991367) 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, 189495653 + 189495654.

It is an arithmetic number, because the mean of its divisors is an integer number (189495654).

Almost surely, 2^378991307 is an apocalyptic number.

378991307 is a deficient number, since it is larger than the sum of its proper divisors (1).

378991307 is an equidigital number, since it uses as much as digits as its factorization.

378991307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 378991307 is about 19467.6990679433. The cubic root of 378991307 is about 723.6741886123.

The spelling of 378991307 in words is "three hundred seventy-eight million, nine hundred ninety-one thousand, three hundred seven".