2123209 has 8 divisors (see below), whose sum is σ = 2328480. Its totient is φ = 1920000.

The previous prime is 2123203. The next prime is 2123213. The reversal of 2123209 is 9023212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2123209 - 2⁷ = 2123081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2123203) 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, 2377 + ... + 3145.

It is an arithmetic number, because the mean of its divisors is an integer number (291060).

2^2123209 is an apocalyptic number.

It is an amenable number.

2123209 is a deficient number, since it is larger than the sum of its proper divisors (205271).

2123209 is a wasteful number, since it uses less digits than its factorization.

2123209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 2123209 is about 1457.1235362865. The cubic root of 2123209 is about 128.5279504371.

It can be divided in two parts, 2123 and 209, that added together give a palindrome (2332).

The spelling of 2123209 in words is "two million, one hundred twenty-three thousand, two hundred nine".