2162809 has 8 divisors (see below), whose sum is σ = 2384928. Its totient is φ = 1944960.

The previous prime is 2162807. The next prime is 2162813. The reversal of 2162809 is 9082612.

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 2162809 - 2¹ = 2162807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2162803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54 + ... + 2080.

It is an arithmetic number, because the mean of its divisors is an integer number (298116).

2^2162809 is an apocalyptic number.

It is an amenable number.

2162809 is a deficient number, since it is larger than the sum of its proper divisors (222119).

2162809 is a wasteful number, since it uses less digits than its factorization.

2162809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135.

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

The square root of 2162809 is about 1470.6491763844. The cubic root of 2162809 is about 129.3220923793.

It can be divided in two parts, 216 and 2809, that added together give a square (3025 = 55²).

The spelling of 2162809 in words is "two million, one hundred sixty-two thousand, eight hundred nine".