2163868 has 24 divisors (see below), whose sum is σ = 4373600. Its totient is φ = 917568.

The previous prime is 2163859. The next prime is 2163869. The reversal of 2163868 is 8683612.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2698 + ... + 3406.

2^2163868 is an apocalyptic number.

2163868 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2163868 is an abundant number, since it is smaller than the sum of its proper divisors (2209732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2163868 is a wasteful number, since it uses less digits than its factorization.

2163868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829 (or 827 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The square root of 2163868 is about 1471.0091774017. The cubic root of 2163868 is about 129.3431960689.

The spelling of 2163868 in words is "two million, one hundred sixty-three thousand, eight hundred sixty-eight".