819802018 has 32 divisors (see below), whose sum is σ = 1478098944. Its totient is φ = 333405072.

The previous prime is 819802013. The next prime is 819802019. The reversal of 819802018 is 810208918.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (819802013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30871 + ... + 50917.

It is an arithmetic number, because the mean of its divisors is an integer number (46190592).

Almost surely, 2^819802018 is an apocalyptic number.

819802018 is a deficient number, since it is larger than the sum of its proper divisors (658296926).

819802018 is a wasteful number, since it uses less digits than its factorization.

819802018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20206.

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 819802018 is about 28632.1850021964. The cubic root of 819802018 is about 935.9148273059.

The spelling of 819802018 in words is "eight hundred nineteen million, eight hundred two thousand, eighteen".