2163866 has 8 divisors (see below), whose sum is σ = 3290484. Its totient is φ = 1067040.

The previous prime is 2163859. The next prime is 2163869. The reversal of 2163866 is 6683612.

It can be written as a sum of positive squares in 2 ways, for example, as 2163841 + 25 = 1471^2 + 5^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2163869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7265 + ... + 7556.

2^2163866 is an apocalyptic number.

2163866 is a deficient number, since it is larger than the sum of its proper divisors (1126618).

2163866 is a wasteful number, since it uses less digits than its factorization.

2163866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14896.

The product of its digits is 10368, while the sum is 32.

The square root of 2163866 is about 1471.0084975961. The cubic root of 2163866 is about 129.3431562195.

The spelling of 2163866 in words is "two million, one hundred sixty-three thousand, eight hundred sixty-six".