2816209 has 4 divisors (see below), whose sum is σ = 3072240. Its totient is φ = 2560180.

The previous prime is 2816197. The next prime is 2816213. The reversal of 2816209 is 9026182.

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 a cyclic number.

It is not a de Polignac number, because 2816209 - 2¹³ = 2808017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2816239) 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, 127999 + ... + 128020.

It is an arithmetic number, because the mean of its divisors is an integer number (768060).

2^2816209 is an apocalyptic number.

It is an amenable number.

2816209 is a deficient number, since it is larger than the sum of its proper divisors (256031).

2816209 is a wasteful number, since it uses less digits than its factorization.

2816209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256030.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 2816209 is about 1678.1564289422. The cubic root of 2816209 is about 141.2174269005.

It can be divided in two parts, 2816 and 209, that added together give a square (3025 = 55²).

The spelling of 2816209 in words is "two million, eight hundred sixteen thousand, two hundred nine".