394995977 has 2 divisors, whose sum is σ = 394995978. Its totient is φ = 394995976.

The previous prime is 394995967. The next prime is 394996001. The reversal of 394995977 is 779599493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 303142921 + 91853056 = 17411^2 + 9584^2 .

It is a cyclic number.

It is not a de Polignac number, because 394995977 - 2⁴ = 394995961 is a prime.

It is not a weakly prime, because it can be changed into another prime (394995947) 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, 197497988 + 197497989.

It is an arithmetic number, because the mean of its divisors is an integer number (197497989).

Almost surely, 2^394995977 is an apocalyptic number.

It is an amenable number.

394995977 is a deficient number, since it is larger than the sum of its proper divisors (1).

394995977 is an equidigital number, since it uses as much as digits as its factorization.

394995977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19289340, while the sum is 62.

The square root of 394995977 is about 19874.5057045452. The cubic root of 394995977 is about 733.7209011713.

The spelling of 394995977 in words is "three hundred ninety-four million, nine hundred ninety-five thousand, nine hundred seventy-seven".