394213507 has 2 divisors, whose sum is σ = 394213508. Its totient is φ = 394213506.

The previous prime is 394213499. The next prime is 394213549. The reversal of 394213507 is 705312493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 394213507 - 2³ = 394213499 is a prime.

It is not a weakly prime, because it can be changed into another prime (394213597) 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, 197106753 + 197106754.

It is an arithmetic number, because the mean of its divisors is an integer number (197106754).

Almost surely, 2^394213507 is an apocalyptic number.

394213507 is a deficient number, since it is larger than the sum of its proper divisors (1).

394213507 is an equidigital number, since it uses as much as digits as its factorization.

394213507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 394213507 is about 19854.8106765086. The cubic root of 394213507 is about 733.2360910775.

The spelling of 394213507 in words is "three hundred ninety-four million, two hundred thirteen thousand, five hundred seven".