394079561 has 2 divisors, whose sum is σ = 394079562. Its totient is φ = 394079560.

The previous prime is 394079557. The next prime is 394079573. The reversal of 394079561 is 165970493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 280763536 + 113316025 = 16756^2 + 10645^2 .

It is a cyclic number.

It is not a de Polignac number, because 394079561 - 2² = 394079557 is a prime.

It is not a weakly prime, because it can be changed into another prime (394079531) 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, 197039780 + 197039781.

It is an arithmetic number, because the mean of its divisors is an integer number (197039781).

Almost surely, 2^394079561 is an apocalyptic number.

It is an amenable number.

394079561 is a deficient number, since it is larger than the sum of its proper divisors (1).

394079561 is an equidigital number, since it uses as much as digits as its factorization.

394079561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 394079561 is about 19851.4372527533. The cubic root of 394079561 is about 733.1530352667.

The spelling of 394079561 in words is "three hundred ninety-four million, seventy-nine thousand, five hundred sixty-one".