394315378 has 16 divisors (see below), whose sum is σ = 615265560. Its totient is φ = 189302400.

The previous prime is 394315373. The next prime is 394315387. The reversal of 394315378 is 873513493.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 128527569 + 265787809 = 11337^2 + 16303^2 .

It is not an unprimeable number, because it can be changed into a prime (394315373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8283 + ... + 29278.

Almost surely, 2^394315378 is an apocalyptic number.

394315378 is a deficient number, since it is larger than the sum of its proper divisors (220950182).

394315378 is a wasteful number, since it uses less digits than its factorization.

394315378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37773.

The product of its digits is 272160, while the sum is 43.

The square root of 394315378 is about 19857.3759092182. The cubic root of 394315378 is about 733.2992455689.

It can be divided in two parts, 3943 and 15378, that added together give a square (19321 = 139²).

The spelling of 394315378 in words is "three hundred ninety-four million, three hundred fifteen thousand, three hundred seventy-eight".