900018 has 32 divisors (see below), whose sum is σ = 2286720. Its totient is φ = 257040.

The previous prime is 900007. The next prime is 900019. The reversal of 900018 is 810009.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (900019) 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, 813 + ... + 1568.

It is an arithmetic number, because the mean of its divisors is an integer number (71460).

2⁹⁰⁰⁰¹⁸ is an apocalyptic number.

900018 is an abundant number, since it is smaller than the sum of its proper divisors (1386702).

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

900018 is a wasteful number, since it uses less digits than its factorization.

900018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2399 (or 2393 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 900018 is about 948.6927848361. The cubic root of 900018 is about 96.5495821159.

Subtracting from 900018 its reverse (810009), we obtain a palindrome (90009).

It can be divided in two parts, 90001 and 8, that added together give a palindrome (90009).

The spelling of 900018 in words is "nine hundred thousand, eighteen".