2117816 has 16 divisors (see below), whose sum is σ = 4180200. Its totient is φ = 1003104.

The previous prime is 2117813. The next prime is 2117821. The reversal of 2117816 is 6187112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117813) 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, 6815 + ... + 7118.

2^2117816 is an apocalyptic number.

It is an amenable number.

2117816 is a deficient number, since it is larger than the sum of its proper divisors (2062384).

2117816 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 11 representation: 2117816 = (1217168)₁₁.

2117816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13958 (or 13954 counting only the distinct ones).

The product of its digits is 672, while the sum is 26.

The square root of 2117816 is about 1455.2717959199. The cubic root of 2117816 is about 128.4190368477.

The spelling of 2117816 in words is "two million, one hundred seventeen thousand, eight hundred sixteen".