817219893 has 24 divisors (see below), whose sum is σ = 1269777600. Its totient is φ = 466152960.

The previous prime is 817219891. The next prime is 817219901. The reversal of 817219893 is 398912718.

817219893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 817219893 - 2¹ = 817219891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (817219891) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83413 + ... + 92693.

It is an arithmetic number, because the mean of its divisors is an integer number (52907400).

Almost surely, 2^817219893 is an apocalyptic number.

It is an amenable number.

817219893 is a deficient number, since it is larger than the sum of its proper divisors (452557707).

817219893 is a wasteful number, since it uses less digits than its factorization.

817219893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9897 (or 9890 counting only the distinct ones).

The product of its digits is 217728, while the sum is 48.

The square root of 817219893 is about 28587.0581382555. The cubic root of 817219893 is about 934.9311789356.

The spelling of 817219893 in words is "eight hundred seventeen million, two hundred nineteen thousand, eight hundred ninety-three".