2189867 has 2 divisors, whose sum is σ = 2189868. Its totient is φ = 2189866.

The previous prime is 2189843. The next prime is 2189879. The reversal of 2189867 is 7689812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2189867 - 2²⁰ = 1141291 is a prime.

It is not a weakly prime, because it can be changed into another prime (2189167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094933 + 1094934.

It is an arithmetic number, because the mean of its divisors is an integer number (1094934).

2^2189867 is an apocalyptic number.

2189867 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189867 is an equidigital number, since it uses as much as digits as its factorization.

2189867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 2189867 is about 1479.8199214769. The cubic root of 2189867 is about 129.8591571297.

Subtracting 2189867 from its reverse (7689812), we obtain a palindrome (5499945).

The spelling of 2189867 in words is "two million, one hundred eighty-nine thousand, eight hundred sixty-seven".