819868918 has 16 divisors (see below), whose sum is σ = 1387866960. Its totient is φ = 359816800.

The previous prime is 819868891. The next prime is 819868919.

819868918 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (819868919) 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 7 ways as a sum of consecutive naturals, for example, 641893 + ... + 643168.

It is an arithmetic number, because the mean of its divisors is an integer number (86741685).

Almost surely, 2^819868918 is an apocalyptic number.

819868918 is a deficient number, since it is larger than the sum of its proper divisors (567998042).

819868918 is a wasteful number, since it uses less digits than its factorization.

819868918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285103.

The product of its digits is 1990656, while the sum is 58.

The square root of 819868918 is about 28633.3532440753. The cubic root of 819868918 is about 935.9402850781.

The spelling of 819868918 in words is "eight hundred nineteen million, eight hundred sixty-eight thousand, nine hundred eighteen".