187899471918 has 48 divisors (see below), whose sum is σ = 411445485360. Its totient is φ = 61970090112.

The previous prime is 187899471863. The next prime is 187899471919. The reversal of 187899471918 is 819174998781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187899471919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 604930 + ... + 861242.

It is an arithmetic number, because the mean of its divisors is an integer number (8571780945).

Almost surely, 2^187899471918 is an apocalyptic number.

187899471918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

187899471918 is an abundant number, since it is smaller than the sum of its proper divisors (223546013442).

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

187899471918 is a wasteful number, since it uses less digits than its factorization.

187899471918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256753 (or 256750 counting only the distinct ones).

The product of its digits is 73156608, while the sum is 72.

The spelling of 187899471918 in words is "one hundred eighty-seven billion, eight hundred ninety-nine million, four hundred seventy-one thousand, nine hundred eighteen".