909009 has 16 divisors (see below), whose sum is σ = 1362240. Its totient is φ = 599040.

The previous prime is 908993. The next prime is 909019. The reversal of 909009 is 900909.

It is not a de Polignac number, because 909009 - 2⁴ = 908993 is a prime.

It is a super-3 number, since 3×909009³ = 2253335216423663187, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

909009 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (909019) 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, 3409 + ... + 3665.

It is an arithmetic number, because the mean of its divisors is an integer number (85140).

2⁹⁰⁹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

909009 is a deficient number, since it is larger than the sum of its proper divisors (453231).

909009 is a wasteful number, since it uses less digits than its factorization.

909009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397 (or 391 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 27.

The square root of 909009 is about 953.4196347884. The cubic root of 909009 is about 96.8700211107.

Subtracting from 909009 its reverse (900909), we obtain a square (8100 = 90²).

It can be divided in two parts, 90900 and 9, that added together give a palindrome (90909).

The spelling of 909009 in words is "nine hundred nine thousand, nine".