378743999 has 2 divisors, whose sum is σ = 378744000. Its totient is φ = 378743998.

The previous prime is 378743927. The next prime is 378744007. The reversal of 378743999 is 999347873.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 378743999 - 2¹² = 378739903 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378743899) 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, 189371999 + 189372000.

It is an arithmetic number, because the mean of its divisors is an integer number (189372000).

Almost surely, 2^378743999 is an apocalyptic number.

378743999 is a deficient number, since it is larger than the sum of its proper divisors (1).

378743999 is an equidigital number, since it uses as much as digits as its factorization.

378743999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10287648, while the sum is 59.

The square root of 378743999 is about 19461.3462792274. The cubic root of 378743999 is about 723.5167449316.

The spelling of 378743999 in words is "three hundred seventy-eight million, seven hundred forty-three thousand, nine hundred ninety-nine".