2166868 has 30 divisors (see below), whose sum is σ = 4283930. Its totient is φ = 958320.

The previous prime is 2166833. The next prime is 2166877. The reversal of 2166868 is 8686612.

It can be written as a sum of positive squares in only one way, i.e., 2108304 + 58564 = 1452^2 + 242^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 58546 + ... + 58582.

2^2166868 is an apocalyptic number.

It is an amenable number.

2166868 is a deficient number, since it is larger than the sum of its proper divisors (2117062).

2166868 is an equidigital number, since it uses as much as digits as its factorization.

2166868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85 (or 50 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 2166868 is about 1472.0285323322. The cubic root of 2166868 is about 129.4029425358.

Multiplying 2166868 by its sum of digits (37), we get a square (80174116 = 8954²).

2166868 divided by its sum of digits (37) gives a square (58564 = 242²).

It can be divided in two parts, 21668 and 68, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 2166868 in words is "two million, one hundred sixty-six thousand, eight hundred sixty-eight".