394729609 has 2 divisors, whose sum is σ = 394729610. Its totient is φ = 394729608.

The previous prime is 394729567. The next prime is 394729631. The reversal of 394729609 is 906927493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 371718400 + 23011209 = 19280^2 + 4797^2 .

It is a cyclic number.

It is not a de Polignac number, because 394729609 - 2⁷ = 394729481 is a prime.

It is a super-2 number, since 2×394729609² = 311622928442585762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (394729669) 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 as a sum of consecutive naturals, namely, 197364804 + 197364805.

It is an arithmetic number, because the mean of its divisors is an integer number (197364805).

Almost surely, 2^394729609 is an apocalyptic number.

It is an amenable number.

394729609 is a deficient number, since it is larger than the sum of its proper divisors (1).

394729609 is an equidigital number, since it uses as much as digits as its factorization.

394729609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 734832, while the sum is 49.

The square root of 394729609 is about 19867.8033259845. The cubic root of 394729609 is about 733.5559343288. Note that the first 3 decimals are identical.

The spelling of 394729609 in words is "three hundred ninety-four million, seven hundred twenty-nine thousand, six hundred nine".