2148209 has 8 divisors (see below), whose sum is σ = 2505600. Its totient is φ = 1841028.

The previous prime is 2148203. The next prime is 2148227. The reversal of 2148209 is 9028412.

It is not a de Polignac number, because 2148209 - 2²⁰ = 1099633 is a prime.

It is a super-2 number, since 2×2148209² = 9229603815362, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2148203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2789 + ... + 3474.

It is an arithmetic number, because the mean of its divisors is an integer number (313200).

2^2148209 is an apocalyptic number.

It is an amenable number.

2148209 is a deficient number, since it is larger than the sum of its proper divisors (357391).

2148209 is an frugal number, since it uses more digits than its factorization.

2148209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6284 (or 6270 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 2148209 is about 1465.6769766903. The cubic root of 2148209 is about 129.0304397049.

The spelling of 2148209 in words is "two million, one hundred forty-eight thousand, two hundred nine".