2199666 has 32 divisors (see below), whose sum is σ = 5096448. Its totient is φ = 619920.

The previous prime is 2199661. The next prime is 2199683. The reversal of 2199666 is 6669912.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2199661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3171 + ... + 3801.

It is an arithmetic number, because the mean of its divisors is an integer number (159264).

2^2199666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2199666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2548224).

2199666 is an abundant number, since it is smaller than the sum of its proper divisors (2896782).

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

2199666 is a wasteful number, since it uses less digits than its factorization.

2199666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726.

The product of its digits is 34992, while the sum is 39.

The square root of 2199666 is about 1483.1271017684. The cubic root of 2199666 is about 130.0525625711.

The spelling of 2199666 in words is "two million, one hundred ninety-nine thousand, six hundred sixty-six".