819493 has 2 divisors, whose sum is σ = 819494. Its totient is φ = 819492.

The previous prime is 819491. The next prime is 819499. The reversal of 819493 is 394918.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 804609 + 14884 = 897^2 + 122^2 .

It is a cyclic number.

It is not a de Polignac number, because 819493 - 2¹ = 819491 is a prime.

Together with 819491, it forms a pair of twin primes.

819493 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (819491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409746 + 409747.

It is an arithmetic number, because the mean of its divisors is an integer number (409747).

2⁸¹⁹⁴⁹³ is an apocalyptic number.

It is an amenable number.

819493 is a deficient number, since it is larger than the sum of its proper divisors (1).

819493 is an equidigital number, since it uses as much as digits as its factorization.

819493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 819493 is about 905.2585266099. The cubic root of 819493 is about 93.5797217254.

The spelling of 819493 in words is "eight hundred nineteen thousand, four hundred ninety-three".