493969393 has 2 divisors, whose sum is σ = 493969394. Its totient is φ = 493969392.

The previous prime is 493969387. The next prime is 493969397. The reversal of 493969393 is 393969394.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 479741409 + 14227984 = 21903^2 + 3772^2 .

It is a cyclic number.

It is not a de Polignac number, because 493969393 - 2¹³ = 493961201 is a prime.

It is a super-2 number, since 2×493969393² = 488011522441576898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (493969397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246984696 + 246984697.

It is an arithmetic number, because the mean of its divisors is an integer number (246984697).

Almost surely, 2^493969393 is an apocalyptic number.

It is an amenable number.

493969393 is a deficient number, since it is larger than the sum of its proper divisors (1).

493969393 is an equidigital number, since it uses as much as digits as its factorization.

493969393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4251528, while the sum is 55.

The square root of 493969393 is about 22225.4222232110. The cubic root of 493969393 is about 790.4966129241.

Subtracting from 493969393 its reverse (393969394), we obtain a palindrome (99999999).

The spelling of 493969393 in words is "four hundred ninety-three million, nine hundred sixty-nine thousand, three hundred ninety-three".