394487563 has 2 divisors, whose sum is σ = 394487564. Its totient is φ = 394487562.

The previous prime is 394487531. The next prime is 394487579. The reversal of 394487563 is 365784493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 394487563 - 2⁵ = 394487531 is a prime.

It is not a weakly prime, because it can be changed into another prime (394487503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197243781 + 197243782.

It is an arithmetic number, because the mean of its divisors is an integer number (197243782).

Almost surely, 2^394487563 is an apocalyptic number.

394487563 is a deficient number, since it is larger than the sum of its proper divisors (1).

394487563 is an equidigital number, since it uses as much as digits as its factorization.

394487563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2177280, while the sum is 49.

The square root of 394487563 is about 19861.7109786645. The cubic root of 394487563 is about 733.4059661989.

The spelling of 394487563 in words is "three hundred ninety-four million, four hundred eighty-seven thousand, five hundred sixty-three".