2149209 has 6 divisors (see below), whose sum is σ = 3104426. Its totient is φ = 1432800.

The previous prime is 2149207. The next prime is 2149211. The reversal of 2149209 is 9029412.

It is an interprime number because it is at equal distance from previous prime (2149207) and next prime (2149211).

It can be written as a sum of positive squares in only one way, i.e., 1108809 + 1040400 = 1053^2 + 1020^2 .

It is not a de Polignac number, because 2149209 - 2¹ = 2149207 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2149207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119392 + ... + 119409.

2^2149209 is an apocalyptic number.

It is an amenable number.

2149209 is a deficient number, since it is larger than the sum of its proper divisors (955217).

2149209 is a wasteful number, since it uses less digits than its factorization.

2149209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238807 (or 238804 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 2149209 is about 1466.0180762869. The cubic root of 2149209 is about 129.0504579966.

The spelling of 2149209 in words is "two million, one hundred forty-nine thousand, two hundred nine".