2117867 has 4 divisors (see below), whose sum is σ = 2162976. Its totient is φ = 2072760.

The previous prime is 2117861. The next prime is 2117887. The reversal of 2117867 is 7687112.

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

It is a cyclic number.

It is not a de Polignac number, because 2117867 - 2⁸ = 2117611 is a prime.

It is a Duffinian number.

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, 22484 + ... + 22577.

It is an arithmetic number, because the mean of its divisors is an integer number (540744).

2^2117867 is an apocalyptic number.

2117867 is a deficient number, since it is larger than the sum of its proper divisors (45109).

2117867 is an equidigital number, since it uses as much as digits as its factorization.

2117867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45108.

The product of its digits is 4704, while the sum is 32.

The square root of 2117867 is about 1455.2893183144. The cubic root of 2117867 is about 128.4200676767.

The spelling of 2117867 in words is "two million, one hundred seventeen thousand, eight hundred sixty-seven".