2143666 has 16 divisors (see below), whose sum is σ = 3891456. Its totient is φ = 864576.

The previous prime is 2143627. The next prime is 2143667. The reversal of 2143666 is 6663412.

It is not an unprimeable number, because it can be changed into a prime (2143667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4266 + ... + 4741.

It is an arithmetic number, because the mean of its divisors is an integer number (243216).

2^2143666 is an apocalyptic number.

2143666 is a deficient number, since it is larger than the sum of its proper divisors (1747790).

2143666 is a wasteful number, since it uses less digits than its factorization.

2143666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9033.

The product of its digits is 5184, while the sum is 28.

The square root of 2143666 is about 1464.1263606670. The cubic root of 2143666 is about 128.9394183017.

It can be divided in two parts, 2143 and 666, that added together give a square (2809 = 53²).

The spelling of 2143666 in words is "two million, one hundred forty-three thousand, six hundred sixty-six".