2118866 has 4 divisors (see below), whose sum is σ = 3178302. Its totient is φ = 1059432.

The previous prime is 2118841. The next prime is 2118871. The reversal of 2118866 is 6688112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1635841 + 483025 = 1279^2 + 695^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 529715 + ... + 529718.

2^2118866 is an apocalyptic number.

2118866 is a deficient number, since it is larger than the sum of its proper divisors (1059436).

2118866 is a wasteful number, since it uses less digits than its factorization.

2118866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059435.

The product of its digits is 4608, while the sum is 32.

The square root of 2118866 is about 1455.6325085680. The cubic root of 2118866 is about 128.4402564611.

It can be divided in two parts, 2 and 118866, that multiplied together give a palindrome (237732).

The spelling of 2118866 in words is "two million, one hundred eighteen thousand, eight hundred sixty-six".