819768493 has 4 divisors (see below), whose sum is σ = 819862560. Its totient is φ = 819674428.

The previous prime is 819768421. The next prime is 819768497. The reversal of 819768493 is 394867918.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-819768493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819768497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32455 + ... + 51892.

It is an arithmetic number, because the mean of its divisors is an integer number (204965640).

Almost surely, 2^819768493 is an apocalyptic number.

It is an amenable number.

819768493 is a deficient number, since it is larger than the sum of its proper divisors (94067).

819768493 is an equidigital number, since it uses as much as digits as its factorization.

819768493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94066.

The product of its digits is 2612736, while the sum is 55.

The square root of 819768493 is about 28631.5995536400. The cubic root of 819768493 is about 935.9020693589.

The spelling of 819768493 in words is "eight hundred nineteen million, seven hundred sixty-eight thousand, four hundred ninety-three".