819202018 has 16 divisors (see below), whose sum is σ = 1308283704. Its totient is φ = 383374080.

The previous prime is 819202009. The next prime is 819202019. The reversal of 819202018 is 810202918.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 436099689 + 383102329 = 20883^2 + 19573^2 .

It is not an unprimeable number, because it can be changed into a prime (819202019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60405 + ... + 72712.

Almost surely, 2^819202018 is an apocalyptic number.

819202018 is a deficient number, since it is larger than the sum of its proper divisors (489081686).

819202018 is a wasteful number, since it uses less digits than its factorization.

819202018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133317.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 819202018 is about 28621.7053649848. The cubic root of 819202018 is about 935.6864445436.

It can be divided in two parts, 81920 and 2018, that added together give a palindrome (83938).

The spelling of 819202018 in words is "eight hundred nineteen million, two hundred two thousand, eighteen".