394648393 has 2 divisors, whose sum is σ = 394648394. Its totient is φ = 394648392.

The previous prime is 394648391. The next prime is 394648399. The reversal of 394648393 is 393846493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 214095424 + 180552969 = 14632^2 + 13437^2 .

It is a cyclic number.

It is not a de Polignac number, because 394648393 - 2¹ = 394648391 is a prime.

Together with 394648391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (394648391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197324196 + 197324197.

It is an arithmetic number, because the mean of its divisors is an integer number (197324197).

Almost surely, 2^394648393 is an apocalyptic number.

It is an amenable number.

394648393 is a deficient number, since it is larger than the sum of its proper divisors (1).

394648393 is an equidigital number, since it uses as much as digits as its factorization.

394648393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 49.

The square root of 394648393 is about 19865.7593109350. The cubic root of 394648393 is about 733.5056209295.

The spelling of 394648393 in words is "three hundred ninety-four million, six hundred forty-eight thousand, three hundred ninety-three".