2166816 has 24 divisors (see below), whose sum is σ = 5688144. Its totient is φ = 722240.

The previous prime is 2166797. The next prime is 2166821. The reversal of 2166816 is 6186612.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11190 + ... + 11381.

It is an arithmetic number, because the mean of its divisors is an integer number (237006).

2^2166816 is an apocalyptic number.

It is an amenable number.

2166816 is an abundant number, since it is smaller than the sum of its proper divisors (3521328).

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

2166816 is a wasteful number, since it uses less digits than its factorization.

2166816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22584 (or 22576 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 2166816 is about 1472.0108695251. The cubic root of 2166816 is about 129.4019074002.

The spelling of 2166816 in words is "two million, one hundred sixty-six thousand, eight hundred sixteen".