394005971 has 2 divisors, whose sum is σ = 394005972. Its totient is φ = 394005970.

The previous prime is 394005967. The next prime is 394005973. The reversal of 394005971 is 179500493.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 394005971 - 2² = 394005967 is a prime.

It is a Sophie Germain prime.

Together with 394005973, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (394005973) 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, 197002985 + 197002986.

It is an arithmetic number, because the mean of its divisors is an integer number (197002986).

Almost surely, 2^394005971 is an apocalyptic number.

394005971 is a deficient number, since it is larger than the sum of its proper divisors (1).

394005971 is an equidigital number, since it uses as much as digits as its factorization.

394005971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 394005971 is about 19849.5836480265. The cubic root of 394005971 is about 733.1073963519.

The spelling of 394005971 in words is "three hundred ninety-four million, five thousand, nine hundred seventy-one".