999900018 has 32 divisors (see below), whose sum is σ = 2392924800. Its totient is φ = 307661328.

The previous prime is 999900017. The next prime is 999900047. The reversal of 999900018 is 810009999.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (999900017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 711478 + ... + 712881.

It is an arithmetic number, because the mean of its divisors is an integer number (74778900).

Almost surely, 2^999900018 is an apocalyptic number.

999900018 is an abundant number, since it is smaller than the sum of its proper divisors (1393024782).

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

999900018 is a wasteful number, since it uses less digits than its factorization.

999900018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424383 (or 1424377 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 999900018 is about 31621.1957079425. The cubic root of 999900018 is about 999.9666715559.

The spelling of 999900018 in words is "nine hundred ninety-nine million, nine hundred thousand, eighteen".