18407989868 has 12 divisors (see below), whose sum is σ = 33909455160. Its totient is φ = 8719574112.

The previous prime is 18407989837. The next prime is 18407989871. The reversal of 18407989868 is 86898970481.

It is a junction number, because it is equal to n+sod(n) for n = 18407989798 and 18407989807.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121105121 + ... + 121105272.

It is an arithmetic number, because the mean of its divisors is an integer number (2825787930).

Almost surely, 2^18407989868 is an apocalyptic number.

It is an amenable number.

18407989868 is a deficient number, since it is larger than the sum of its proper divisors (15501465292).

18407989868 is a wasteful number, since it uses less digits than its factorization.

18407989868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242210416 (or 242210414 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 68.

The spelling of 18407989868 in words is "eighteen billion, four hundred seven million, nine hundred eighty-nine thousand, eight hundred sixty-eight".