2169009 has 12 divisors (see below), whose sum is σ = 3146052. Its totient is φ = 1440000.

The previous prime is 2169007. The next prime is 2169029. The reversal of 2169009 is 9009612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2030625 + 138384 = 1425^2 + 372^2 .

It is not a de Polignac number, because 2169009 - 2¹ = 2169007 is a prime.

2169009 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2169007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3309 + ... + 3909.

It is an arithmetic number, because the mean of its divisors is an integer number (262171).

2^2169009 is an apocalyptic number.

It is an amenable number.

2169009 is a deficient number, since it is larger than the sum of its proper divisors (977043).

2169009 is a wasteful number, since it uses less digits than its factorization.

2169009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008 (or 1005 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 2169009 is about 1472.7555805360. The cubic root of 2169009 is about 129.4455478848.

The spelling of 2169009 in words is "two million, one hundred sixty-nine thousand, nine".