18840591818 has 8 divisors (see below), whose sum is σ = 29489622048. Its totient is φ = 9010717804.

The previous prime is 18840591817. The next prime is 18840591863. The reversal of 18840591818 is 81819504881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18840591818.

It is not an unprimeable number, because it can be changed into a prime (18840591817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204788996 + ... + 204789087.

It is an arithmetic number, because the mean of its divisors is an integer number (3686202756).

Almost surely, 2^18840591818 is an apocalyptic number.

18840591818 is a deficient number, since it is larger than the sum of its proper divisors (10649030230).

18840591818 is a wasteful number, since it uses less digits than its factorization.

18840591818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409578108.

The product of its (nonzero) digits is 737280, while the sum is 53.

The spelling of 18840591818 in words is "eighteen billion, eight hundred forty million, five hundred ninety-one thousand, eight hundred eighteen".