2166487 has 4 divisors (see below), whose sum is σ = 2169520. Its totient is φ = 2163456.

The previous prime is 2166467. The next prime is 2166509. The reversal of 2166487 is 7846612.

2166487 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2166487 is a prime.

It is a Duffinian number.

2166487 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214 + ... + 2092.

It is an arithmetic number, because the mean of its divisors is an integer number (542380).

2^2166487 is an apocalyptic number.

2166487 is a deficient number, since it is larger than the sum of its proper divisors (3033).

2166487 is a wasteful number, since it uses less digits than its factorization.

2166487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3032.

The product of its digits is 16128, while the sum is 34.

The square root of 2166487 is about 1471.8991133906. The cubic root of 2166487 is about 129.3953577928.

The spelling of 2166487 in words is "two million, one hundred sixty-six thousand, four hundred eighty-seven".