18439108418 has 32 divisors (see below), whose sum is σ = 29475363456. Its totient is φ = 8631836928.

The previous prime is 18439108417. The next prime is 18439108433. The reversal of 18439108418 is 81480193481.

It is not an unprimeable number, because it can be changed into a prime (18439108417) 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, 1046921 + ... + 1064387.

It is an arithmetic number, because the mean of its divisors is an integer number (921105108).

Almost surely, 2^18439108418 is an apocalyptic number.

18439108418 is a deficient number, since it is larger than the sum of its proper divisors (11036255038).

18439108418 is a wasteful number, since it uses less digits than its factorization.

18439108418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17978.

The product of its (nonzero) digits is 221184, while the sum is 47.

The spelling of 18439108418 in words is "eighteen billion, four hundred thirty-nine million, one hundred eight thousand, four hundred eighteen".