1009209 has 4 divisors (see below), whose sum is σ = 1345616. Its totient is φ = 672804.

The previous prime is 1009207. The next prime is 1009237. The reversal of 1009209 is 9029001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1009209 - 2¹ = 1009207 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

1009209 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1009201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168199 + ... + 168204.

It is an arithmetic number, because the mean of its divisors is an integer number (336404).

2^1009209 is an apocalyptic number.

It is an amenable number.

1009209 is a deficient number, since it is larger than the sum of its proper divisors (336407).

1009209 is an equidigital number, since it uses as much as digits as its factorization.

1009209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336406.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 1009209 is about 1004.5939478217. The cubic root of 1009209 is about 100.3060291728.

The spelling of 1009209 in words is "one million, nine thousand, two hundred nine".