2166443 has 4 divisors (see below), whose sum is σ = 2180400. Its totient is φ = 2152488.

The previous prime is 2166431. The next prime is 2166449. The reversal of 2166443 is 3446612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2166443 - 2⁴ = 2166427 is a prime.

It is an Ulam number.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 6743 + ... + 7056.

It is an arithmetic number, because the mean of its divisors is an integer number (545100).

2^2166443 is an apocalyptic number.

2166443 is a deficient number, since it is larger than the sum of its proper divisors (13957).

2166443 is a wasteful number, since it uses less digits than its factorization.

2166443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13956.

The product of its digits is 3456, while the sum is 26.

The square root of 2166443 is about 1471.8841666381. The cubic root of 2166443 is about 129.3944818072.

The spelling of 2166443 in words is "two million, one hundred sixty-six thousand, four hundred forty-three".