378919393 has 2 divisors, whose sum is σ = 378919394. Its totient is φ = 378919392.

The previous prime is 378919381. The next prime is 378919399. The reversal of 378919393 is 393919873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 318515409 + 60403984 = 17847^2 + 7772^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-378919393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 378919393.

It is not a weakly prime, because it can be changed into another prime (378919399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189459696 + 189459697.

It is an arithmetic number, because the mean of its divisors is an integer number (189459697).

Almost surely, 2^378919393 is an apocalyptic number.

It is an amenable number.

378919393 is a deficient number, since it is larger than the sum of its proper divisors (1).

378919393 is an equidigital number, since it uses as much as digits as its factorization.

378919393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1102248, while the sum is 52.

The square root of 378919393 is about 19465.8519721075. The cubic root of 378919393 is about 723.6284130702.

The spelling of 378919393 in words is "three hundred seventy-eight million, nine hundred nineteen thousand, three hundred ninety-three".