394972789 has 2 divisors, whose sum is σ = 394972790. Its totient is φ = 394972788.

The previous prime is 394972771. The next prime is 394972811. The reversal of 394972789 is 987279493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 375700689 + 19272100 = 19383^2 + 4390^2 .

It is a cyclic number.

It is not a de Polignac number, because 394972789 - 2⁷ = 394972661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394972709) 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, 197486394 + 197486395.

It is an arithmetic number, because the mean of its divisors is an integer number (197486395).

Almost surely, 2^394972789 is an apocalyptic number.

It is an amenable number.

394972789 is a deficient number, since it is larger than the sum of its proper divisors (1).

394972789 is an equidigital number, since it uses as much as digits as its factorization.

394972789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6858432, while the sum is 58.

The square root of 394972789 is about 19873.9223355633. The cubic root of 394972789 is about 733.7065433431.

The spelling of 394972789 in words is "three hundred ninety-four million, nine hundred seventy-two thousand, seven hundred eighty-nine".