2117866 has 8 divisors (see below), whose sum is σ = 3195684. Its totient is φ = 1052640.

The previous prime is 2117861. The next prime is 2117887. The reversal of 2117866 is 6687112.

It can be written as a sum of positive squares in 2 ways, for example, as 2117025 + 841 = 1455^2 + 29^2 .

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 (2117861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2715 + ... + 3406.

2^2117866 is an apocalyptic number.

2117866 is a deficient number, since it is larger than the sum of its proper divisors (1077818).

2117866 is a wasteful number, since it uses less digits than its factorization.

2117866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6296.

The product of its digits is 4032, while the sum is 31.

The square root of 2117866 is about 1455.2889747401. The cubic root of 2117866 is about 128.4200474645.

The spelling of 2117866 in words is "two million, one hundred seventeen thousand, eight hundred sixty-six".