819812718 has 32 divisors (see below), whose sum is σ = 1847473920. Its totient is φ = 269420760.

The previous prime is 819812717. The next prime is 819812761. The reversal of 819812718 is 817218918.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819812717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103080 + ... + 110747.

It is an arithmetic number, because the mean of its divisors is an integer number (57733560).

Almost surely, 2^819812718 is an apocalyptic number.

819812718 is an abundant number, since it is smaller than the sum of its proper divisors (1027661202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

819812718 is a wasteful number, since it uses less digits than its factorization.

819812718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213909 (or 213903 counting only the distinct ones).

The product of its digits is 64512, while the sum is 45.

The square root of 819812718 is about 28632.3718542492. The cubic root of 819812718 is about 935.9188991204.

The spelling of 819812718 in words is "eight hundred nineteen million, eight hundred twelve thousand, seven hundred eighteen".