394131407 has 2 divisors, whose sum is σ = 394131408. Its totient is φ = 394131406.

The previous prime is 394131379. The next prime is 394131433. The reversal of 394131407 is 704131493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 394131407 - 2⁶ = 394131343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394131007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197065703 + 197065704.

It is an arithmetic number, because the mean of its divisors is an integer number (197065704).

Almost surely, 2^394131407 is an apocalyptic number.

394131407 is a deficient number, since it is larger than the sum of its proper divisors (1).

394131407 is an equidigital number, since it uses as much as digits as its factorization.

394131407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 394131407 is about 19852.7430598394. The cubic root of 394131407 is about 733.1851856151.

The spelling of 394131407 in words is "three hundred ninety-four million, one hundred thirty-one thousand, four hundred seven".