18409988127 has 16 divisors (see below), whose sum is σ = 24659022560. Its totient is φ = 12217226112.

The previous prime is 18409988119. The next prime is 18409988131. The reversal of 18409988127 is 72188990481.

It is not a de Polignac number, because 18409988127 - 2³ = 18409988119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18409988167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 898149 + ... + 918417.

It is an arithmetic number, because the mean of its divisors is an integer number (1541188910).

Almost surely, 2^18409988127 is an apocalyptic number.

18409988127 is a deficient number, since it is larger than the sum of its proper divisors (6249034433).

18409988127 is a wasteful number, since it uses less digits than its factorization.

18409988127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21642.

The product of its (nonzero) digits is 2322432, while the sum is 57.

The spelling of 18409988127 in words is "eighteen billion, four hundred nine million, nine hundred eighty-eight thousand, one hundred twenty-seven".