394563493 has 2 divisors, whose sum is σ = 394563494. Its totient is φ = 394563492.

The previous prime is 394563457. The next prime is 394563497. The reversal of 394563493 is 394365493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 251952129 + 142611364 = 15873^2 + 11942^2 .

It is an emirp because it is prime and its reverse (394365493) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394563493 is a prime.

It is a super-2 number, since 2×394563493² = 311360700016722098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394563497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197281746 + 197281747.

It is an arithmetic number, because the mean of its divisors is an integer number (197281747).

Almost surely, 2^394563493 is an apocalyptic number.

It is an amenable number.

394563493 is a deficient number, since it is larger than the sum of its proper divisors (1).

394563493 is an equidigital number, since it uses as much as digits as its factorization.

394563493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1049760, while the sum is 46.

The square root of 394563493 is about 19863.6223534380. The cubic root of 394563493 is about 733.4530179083.

The spelling of 394563493 in words is "three hundred ninety-four million, five hundred sixty-three thousand, four hundred ninety-three".