394306489 has 2 divisors, whose sum is σ = 394306490. Its totient is φ = 394306488.

The previous prime is 394306481. The next prime is 394306511. The reversal of 394306489 is 984603493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 373146489 + 21160000 = 19317^2 + 4600^2 .

It is a cyclic number.

It is not a de Polignac number, because 394306489 - 2³ = 394306481 is a prime.

It is not a weakly prime, because it can be changed into another prime (394306481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197153244 + 197153245.

It is an arithmetic number, because the mean of its divisors is an integer number (197153245).

Almost surely, 2^394306489 is an apocalyptic number.

It is an amenable number.

394306489 is a deficient number, since it is larger than the sum of its proper divisors (1).

394306489 is an equidigital number, since it uses as much as digits as its factorization.

394306489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 46.

The square root of 394306489 is about 19857.1520868427. The cubic root of 394306489 is about 733.2937353045.

The spelling of 394306489 in words is "three hundred ninety-four million, three hundred six thousand, four hundred eighty-nine".