2166819 has 4 divisors (see below), whose sum is σ = 2889096. Its totient is φ = 1444544.

The previous prime is 2166797. The next prime is 2166821. The reversal of 2166819 is 9186612.

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 2166819 - 2⁷ = 2166691 is a prime.

It is a super-2 number, since 2×2166819² = 9390209157522, which contains 22 as substring.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 2166819.

It is not an unprimeable number, because it can be changed into a prime (2166119) 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, 361134 + ... + 361139.

It is an arithmetic number, because the mean of its divisors is an integer number (722274).

2^2166819 is an apocalyptic number.

2166819 is a deficient number, since it is larger than the sum of its proper divisors (722277).

2166819 is an equidigital number, since it uses as much as digits as its factorization.

2166819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722276.

The product of its digits is 5184, while the sum is 33.

The square root of 2166819 is about 1472.0118885389. The cubic root of 2166819 is about 129.4019671200.

The spelling of 2166819 in words is "two million, one hundred sixty-six thousand, eight hundred nineteen".