900018999 has 64 divisors (see below), whose sum is σ = 1538880000. Its totient is φ = 514149120.

The previous prime is 900018989. The next prime is 900019009. The reversal of 900018999 is 999810009.

It is an interprime number because it is at equal distance from previous prime (900018989) and next prime (900019009).

It is not a de Polignac number, because 900018999 - 2⁵ = 900018967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (900018989) 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 63 ways as a sum of consecutive naturals, for example, 1969179 + ... + 1969635.

It is an arithmetic number, because the mean of its divisors is an integer number (24045000).

Almost surely, 2^900018999 is an apocalyptic number.

900018999 is a gapful number since it is divisible by the number (99) formed by its first and last digit.

900018999 is a deficient number, since it is larger than the sum of its proper divisors (638861001).

900018999 is a wasteful number, since it uses less digits than its factorization.

900018999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845 (or 839 counting only the distinct ones).

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

The square root of 900018999 is about 30000.3166483289. The cubic root of 900018999 is about 965.4961783848.

The spelling of 900018999 in words is "nine hundred million, eighteen thousand, nine hundred ninety-nine".