2166009 has 8 divisors (see below), whose sum is σ = 2894880. Its totient is φ = 1440576.

The previous prime is 2166007. The next prime is 2166023. The reversal of 2166009 is 9006612.

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

It is not a de Polignac number, because 2166009 - 2¹ = 2166007 is a prime.

2166009 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2166009.

It is not an unprimeable number, because it can be changed into a prime (2166007) 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, 1729 + ... + 2705.

It is an arithmetic number, because the mean of its divisors is an integer number (361860).

2^2166009 is an apocalyptic number.

It is an amenable number.

2166009 is a deficient number, since it is larger than the sum of its proper divisors (728871).

2166009 is an equidigital number, since it uses as much as digits as its factorization.

2166009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 2166009 is about 1471.7367291741. The cubic root of 2166009 is about 129.3858407682.

The spelling of 2166009 in words is "two million, one hundred sixty-six thousand, nine".