18609868440 has 192 divisors, whose sum is σ = 63944056800. Its totient is φ = 4680861696.

The previous prime is 18609868439. The next prime is 18609868451. The reversal of 18609868440 is 4486890681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1587882 + ... + 1599558.

Almost surely, 2^18609868440 is an apocalyptic number.

18609868440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18609868440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31972028400).

18609868440 is an abundant number, since it is smaller than the sum of its proper divisors (45334188360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18609868440 is a wasteful number, since it uses less digits than its factorization.

18609868440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11946 (or 11939 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 54.

The spelling of 18609868440 in words is "eighteen billion, six hundred nine million, eight hundred sixty-eight thousand, four hundred forty".