999855918 has 48 divisors (see below), whose sum is σ = 2337104016. Its totient is φ = 307756800.

The previous prime is 999855911. The next prime is 999855919. The reversal of 999855918 is 819558999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999855911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14608 + ... + 47043.

It is an arithmetic number, because the mean of its divisors is an integer number (48689667).

Almost surely, 2^999855918 is an apocalyptic number.

999855918 is an abundant number, since it is smaller than the sum of its proper divisors (1337248098).

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

999855918 is a wasteful number, since it uses less digits than its factorization.

999855918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61729 (or 61726 counting only the distinct ones).

The product of its digits is 10497600, while the sum is 63.

The square root of 999855918 is about 31620.4983831691. The cubic root of 999855918 is about 999.9519703599.

The spelling of 999855918 in words is "nine hundred ninety-nine million, eight hundred fifty-five thousand, nine hundred eighteen".