2166447 has 4 divisors (see below), whose sum is σ = 2888600. Its totient is φ = 1444296.

The previous prime is 2166431. The next prime is 2166449. The reversal of 2166447 is 7446612.

2166447 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.

It is not a de Polignac number, because 2166447 - 2⁴ = 2166431 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166449) 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, 361072 + ... + 361077.

It is an arithmetic number, because the mean of its divisors is an integer number (722150).

2^2166447 is an apocalyptic number.

2166447 is a deficient number, since it is larger than the sum of its proper divisors (722153).

2166447 is an equidigital number, since it uses as much as digits as its factorization.

2166447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722152.

The product of its digits is 8064, while the sum is 30.

The square root of 2166447 is about 1471.8855254401. The cubic root of 2166447 is about 129.3945614427.

The spelling of 2166447 in words is "two million, one hundred sixty-six thousand, four hundred forty-seven".