2187009 has 12 divisors (see below), whose sum is σ = 3446352. Its totient is φ = 1325400.

The previous prime is 2186993. The next prime is 2187011. The reversal of 2187009 is 9007812.

It is not a de Polignac number, because 2187009 - 2⁴ = 2186993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2187049) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10947 + ... + 11144.

It is an arithmetic number, because the mean of its divisors is an integer number (287196).

2^2187009 is an apocalyptic number.

It is an amenable number.

2187009 is a deficient number, since it is larger than the sum of its proper divisors (1259343).

2187009 is a wasteful number, since it uses less digits than its factorization.

2187009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22108 (or 22105 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 2187009 is about 1478.8539481639. The cubic root of 2187009 is about 129.8026393829.

It can be divided in two parts, 218 and 7009, that added together give a palindrome (7227).

The spelling of 2187009 in words is "two million, one hundred eighty-seven thousand, nine".