2166444 has 36 divisors (see below), whose sum is σ = 6259344. Its totient is φ = 618912.

The previous prime is 2166431. The next prime is 2166449. The reversal of 2166444 is 4446612.

2166444 is a `hidden beast` number, since 2 + 16 + 644 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (2166449) 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, 4047 + ... + 4550.

2^2166444 is an apocalyptic number.

It is an amenable number.

2166444 is an abundant number, since it is smaller than the sum of its proper divisors (4092900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2166444 is a wasteful number, since it uses less digits than its factorization.

2166444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8614 (or 8609 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 2166444 is about 1471.8845063387. The cubic root of 2166444 is about 129.3945017161.

The spelling of 2166444 in words is "two million, one hundred sixty-six thousand, four hundred forty-four".