818404818 has 64 divisors (see below), whose sum is σ = 2061020160. Its totient is φ = 210456000.

The previous prime is 818404789. The next prime is 818404823.

818404818 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×818404818² = 1339572892251226248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 818404818.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 37893 + ... + 55431.

It is an arithmetic number, because the mean of its divisors is an integer number (32203440).

Almost surely, 2^818404818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 818404818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1030510080).

818404818 is an abundant number, since it is smaller than the sum of its proper divisors (1242615342).

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

818404818 is a wasteful number, since it uses less digits than its factorization.

818404818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17663.

The product of its (nonzero) digits is 65536, while the sum is 42.

The square root of 818404818 is about 28607.7754815015. The cubic root of 818404818 is about 935.3828274003.

The spelling of 818404818 in words is "eight hundred eighteen million, four hundred four thousand, eight hundred eighteen".