394869641 has 2 divisors, whose sum is σ = 394869642. Its totient is φ = 394869640.

The previous prime is 394869611. The next prime is 394869649. The reversal of 394869641 is 146968493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320410000 + 74459641 = 17900^2 + 8629^2 .

It is a cyclic number.

It is not a de Polignac number, because 394869641 - 2¹⁸ = 394607497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 394869641.

It is not a weakly prime, because it can be changed into another prime (394869649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197434820 + 197434821.

It is an arithmetic number, because the mean of its divisors is an integer number (197434821).

Almost surely, 2^394869641 is an apocalyptic number.

It is an amenable number.

394869641 is a deficient number, since it is larger than the sum of its proper divisors (1).

394869641 is an equidigital number, since it uses as much as digits as its factorization.

394869641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 50.

The square root of 394869641 is about 19871.3271071662. The cubic root of 394869641 is about 733.6426680977.

The spelling of 394869641 in words is "three hundred ninety-four million, eight hundred sixty-nine thousand, six hundred forty-one".