2216646 has 24 divisors (see below), whose sum is σ = 4981704. Its totient is φ = 738720.

The previous prime is 2216629. The next prime is 2216653. The reversal of 2216646 is 6466122.

It is a happy number.

2216646 is a `hidden beast` number, since 2 + 2 + 16 + 646 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1795 + ... + 2766.

It is an arithmetic number, because the mean of its divisors is an integer number (207571).

2^2216646 is an apocalyptic number.

2216646 is an abundant number, since it is smaller than the sum of its proper divisors (2765058).

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

2216646 is an equidigital number, since it uses as much as digits as its factorization.

2216646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4578 (or 4566 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 2216646 is about 1488.8404884339. The cubic root of 2216646 is about 130.3863457544.

The spelling of 2216646 in words is "two million, two hundred sixteen thousand, six hundred forty-six".